p.1
cloisters: It's all very well for the TARDIS to have a Cloister Room in one story.  But's it's popped up again so much in fan fiction, and eventually became the heart of the TARDIS in the TV Movie, and generally associated with Gallifreyan things.  So what exactly are cloisters?  In this context, they are covered walks or arcades connected with a monastery, college or large church, serving as a way of communication between different parts of the group of buildings, and sometimes as a place of exercise or study; often running around the open court of a quadrangle, with a plain wall on the one side, and a series of windows or an open collonade on the other.  The word can also mean any enclosed space, an uterus and it can also be used as a verb or an adjective.  If you look at the cloisters on any cathedral you'll see they are off to the side.  And any film with stereotyped monks or clergymen will show them using the cloisters to walk around and meditate, or have quiet conversations about faith.  A Cloister Room can refer to a holy of holies, like in the TV Movie, but not in the same context as the room we saw in 'Logopolis'.
pellucid:
Everywhere, there was a terrible sense of stagnancy, imbuing the whole place with a fetid, neglected atmosphere as though some great cathedral had been flooded by a brackish lagoon:  Well said.
a white-haired individual with piercing eyes and a down-turned, haughty mouth: The First Doctor.
A man with a face like a deflating balloon: Is this supposed to be any Time Lord in particular?  His line at the end of the Prologue makes him sound a bit like the Monk.
spindly key: Originally the TARDIS key was a typical Master-type key on a silk ribbon.  Round about the Pertwee era the TARDIS key was done up as that odd little crest-shaped thing.  I'm not up on the specifics of the TARDIS key, but that crest-shaped design was the one that was revived for the TV Movie.  There was never a key like those old ones with the long shafts.  But of course, he isn't opening the TARDIS door with this one.

p.2
Arranged in a row were eight featureless objects about the size of horse boxes, their dull grey surfaces tinged by the familiar underwater-green: Why make the default TARDISes look like they did in 'The War Games'?  It also rather explodes the possibilities of how the Doctor left Gallifrey, admitting he didn't build the TARDIS himself and picking a random vehicle and so forth.
heliotrope robes: Prydonian ceremonial robes are heliotrope, as established in 'The Deadly Assassin'.  Heliotropes are plants that turn with the sun, or red-green quartz also known as bloodstone which can staunch blood or make you invisible, they do say.
seen the first frosts: Gallifrey is a cold place, as seen in 'The Invasion of Time', 'Cat's Cradle: Time's Crucible' and 'The Infinity Doctors'.
watched the pale silver and bronze leaves: In 'Marco Polo' Susan talked about something like this.

Being Canadian, it's very hard for me to judge the similarity between Mark's crotchety senior citizens in this bit and the people of Spent or Royston Vasey is (in which The League of Gentlemen, which he later co-wrote and acted, is set.)  But Mark is from Darlington, and the locations for Royston Vasey were shot in Lancashire somewhere, so you've got to consider it.

p.3
Jack Prudhoe: How should one pronounce "Prudhoe"?

p.4
The Shepherd's Cross: Possibly as in "The Lord is my Shepherd", and also a double-entendre on irritated sheepminders.  So far in the New Adventures we've seen two Black Swan pubs, in Cheldon Bonniface and Llanfer Ceiriog.
red flock wallpaper:
mahogany: heavy, dark lustrous wood from South America.
colliery: The Place of Coal.
the new Queen Elizabeth II: (Text submitted by Paul Andinach) The ocean liner, which was launched in 1967 and made its maiden voyage in 1969.

p.5
pint of mild: Ale, not lager.
Ilkley Moor: Ilkley is a town about ten miles north of Bradford, in West Yorkshire.

p.6
the falls at Haworth: Haworth is where the Brontës come from.
Castle Howard:
chrysanths: Chrysanthemums, of course.  I only mention it because the Great Peter Cook used the word that way in the Beyond the Fringe routine where he would describe the events of the Second World War from the point of view of his garden.

p.7
their faces blurred by the crude film process: This is 1968, and not all programs are broadcast from videorecordings.  The process is to take the film copy and run it through a projector combined with a videocamera, and broadcast that signal.  If you want to know more, go ask Steve Roberts.  Everyone else does.  And Nightshade is a dodgy combination of Doctor Who and Quatermass.  The fictional Doctor in Doctor Who is Professor X, who appears in 'No Future'.

p.8
new second channel: BBC2 was inaugurated in (Text submitted by Paul Andinach) 1964. Of course, it was really the third channel, because ITV had been around nearly a decade at that point.

p.9
bra-burning malarkey: A bit of a fad in American universities in 1968.  Not too popular because although bras can be uncomfortable, some bust sizes can be really painful without proper support.  So I'm told, I suppose.
"Of course, it was all live in those days.": Getting back much before 1963 a great deal of television was broadcast live, not just being recorded all in one take like early Doctor Whos.  Some episodes of Quatermass were done live, with filmed inserts.
Debbie Reynolds: Las Vegas diva and Carrie Fisher's mum.  Starred in 'The Unsinkable Molly Brown', among others.
bloody anarchist friends: 1968 was a tough year for that sort of thing.  Viet Nam protests surged and President Johnson was forced to back down in the war.  There were riots in Chicago outside the Democratic Convention, and other race riots in the United States climaxed.  Bobby Kennedy and Martin Luther King, Jr were assassinated.  There were general strikes and riots in Paris and Mexico, and two communist revolutions in Czechoslovakia.  Saddam Hussein led the revolution in Iraq.  Liu Shaoqi, the Chinese head of state, was purged at the height of the Cultural Revolution.  A devastating drought began in the Sahel region of Africa (Senegal, Mauretania, Burkina Faso, Niger, Nigeria and Chad) and the realities of African independence began to set in.  And more of the same.

p.13
Apollo 7: The one that went round the Moon on Christmas 1968 was Apollo 8.

p.14
Space Tracking Station: By 1968 radio astronomy was getting really popular.  I get the idea the Crook Marsham radiotelescope is supposed to be like the big 76-metre telescope at Jodrell Bank near Manchester, which was sort of used as the Pharos Project in 'Logopolis'.  To be honest, I was fooled - although some of the model footage for the Pharos/Logopolitan Project was plain to the eye, there are some pieces of location film combined with the model footage that fooled me for years.  It was all filmed in Kent, just like the moon landings;-)
Peter Noone: (Text submitted by chocolate pilchards)  Is he not one of Herman's Hermits (crap 60s pop band)?

p.15
the Brontës' house: Charlotte, Emily and Anne Brontë.  They had a brother, Branwell.  They lived at Haworth, in North Yorkshire.  Northwest of Ripon.

p.16
pulsars - this year's great discovery: Pulsars are older stars that emit regular pulses of electromagnetic radiation, mainly radio waves. They were discovered in 1967 by the radio astronomers Jocelyn Bell Burnell and Antony Hewish at Cambridge.
Gemini, Taurus, Orion: Winter constellations, in the evening.

p.17
Win Prudhoe spent her first night alone in forty years: So although Jack frequented the pub often, she always let him in for the night.
Gibbet corpses: A gibbet is a frame cage for putting dead convicts in to deter criminals.

p.19
breach in the security fence: Of course a radio telescope needs a security fence.  I'm surprised there aren't armed guards, like in 'Logopolis'.

p.20
open prison: radical idea of a prison without bars.

p.22
St Hilda's monastery: Unfortunately my mother has got rid of the copy of Lives of the Saints, so I can't tell you all about St Hilda.
The supplement under which he'd slept after Bobby Kennedy kicked the bucket was so thick...: As I said before, Senator Kennedy was mortally wounded on June 4th, 1968 by the Jordanian immigrant Sirhan B. Sirhan.  He'd just won the California Primary (Kennedy, not Sirhan).  I seem to recall Kennedy actually survived for some time after receiving his injury; it's not really important whether the assassination supplements were put in the English papers for the morning of the 6th, just as he was going farther up and farther in (CS Lewis, The Last Battle).

p.24
playing 'I wanna be adored':
they hadn't been anywhere exciting since the Doctor had pulled his old ship back together again: See 'Cat's Cradle: Witch Mark'.
he did claim to be over nine hundred years old: He celebrated his millennium while being brutally tortured on Ship in 'Set Piece'.  BBC Books in 1999 put his age at somewhere in the early millennial teens.

p.25
almost Edwardian face: Usually the only thing that's almost Edwardian is the Doctor, not Ace's face.
He was wearing a long, muslin nightshirt and a shot-silk blue dressing gown: That's interesting.  Nice change of pace to get him out of that sodden old jumper.
"I think I can promise you something a little recherché.":

p.26
a big red room entirely full of hats: (Text submitted by chocolate pilchards)  Well, there's a boot cupboard, so why not a room of hats?
a patch of what what appeared to be open countryside: Could be the outside landscape room from 'No Future'.  It wouldn't be unprecedented, even though that room was a replica of Heaven which, according to the rules, should only be installed after 'Love and War'.  (Text submitted by chocolate pilchards) Butterfly room from Vampire Science.  Tom Baker often talks about when he wanted a room with lots of sheep inside it, a big field full of the things, as one of the TARDIS rooms.
the vast, mahogany-panelled TARDIS library: The second use of the word "mahogany" in this book.  One of these days I've got to get down and collate all the disparate visions of that the TARDIS Lilibrary look like.
"Lost?  Me!  I know this ship like the back of... the back of..." He gazed distractedly up and down the corridor, "...beyond.": The back of beyond is nowhere.
"that Greek bloke with the minah bird.": Mynah bird?  Anyways it's Theseus and the Minotaur, as recounted in 'The Horns of Nimon'.

p.27
And now, a rather special bit.
 

p.28
And what was he doing (with a Coal Hill School uniform) anyway?: Surely during 'Doctor Who and the Daleks Go Upstairs' the Doctor mentioned he'd been there before.  And I don't recall the students wearing uniforms in 'An Unearthly Child'. (Text submitted by chocolate pilchards)  Not in '100,000BC', no.  But there is a uniform by 'Remembrance of the Daleks'.  Perhaps it's that.  Susan would be of an age where she would be in fifth form at school (year 12) so may not have had to wear uniform.  If they've been on Earth for a while in '100,000BC', she would presumably have been required to wear uniform.  They had only been there six months, and Susan doesn't age like humans.  Maybe Susan had a friend - or the uniform could have been Gillian's.  (Text submitted by Urac Sigma) It's also possible that for some reason the one day of
school we saw in 'An Unearthly Child' was a no-uniform day, which some schools have from time to time. Though it wouldn't have been all that likely in England in 1963, mind.  A no-uniform day might be possible, but since 'An Unearthly Child takes place on a Tuesday, maybe not.  It seems to me a no-uniform day would usually be on Friday.
the Doctor returned, now dressed in a chocolate-brown belted coat, russet waistcoat and checked trousers: Mark Gatiss's valued opinion shows through here, doing away with things like the question-mark jumper that, and I quote, "spoil the mystery of the character".  *'The Pitch of Fear'. (Text submitted by Stephen Graves) Interesting to note how Gatiss seems to foreshadow the 1996 TV movie in  several ways - the tertiary console room sort-of-resembles the larger console room from the TVM, and the seventh Doctor’s costume could also, at a pinch, be the outfit he wears in the TVM. Wonder if Phil Segal read 'Nightshade'?
 
p.30
Mae Wests: military inflatable lifejackets, so-called because they make one look busty.

p.32
Nobby Stiles: Possibly a footballer, connected with the World Cup on the next page. (Text submitted by chocolate pilchards)  part of the 1966 world cup winning team.  Though any team can win the world cup if they get to play all their games at home and shots which hit the crossbar count as goals (spot the disgruntled Scot sick of them going on about it)...

p.33
the sun not even remotely over the yardarm: (Text submitted by chocolate pilchards)  the position of the sun in relation to the yardarm was used by sailors as a way of telling the time.  The higher the sun, the closer it was to midday.

p.34
Durham Cathedral: Durham is more or less my ancestral home. The cathedral is the shrine of the Venerable Bede, a famous dark ages monk from the 8th Century, and St Cuthbert.  It's located above a loop in the River Wear in northern England, and is a magnificent example of Norman architecture and one of the most notable Romanesque buildings in Europe.   Nearby is the castle of the prince-bishops of Durham, now incorporated into Durham University.  Begun in 1093 by Bishop William of St. Calais--the second Norman bishop of Durham after William I's invasion of England in 1066--the cathedral replaced an earlier church erected (995-99) to house the relics of Saint Cuthbert, a 7th-century ecclesiastic. The choir was completed in 1104, the transepts and nave by 1133, and the Galilee, or forechurch (which contains Bede's tomb), by 1175.   The Doctor claims to have been there when the cathedral was finished, forgetting that in most cases cathedrals are constantly being renovated.

p.35
burning the letter to Santa Claus: It makes sense, I suppose, to send it up the chimney.  I'm assuming that the whole chimney business started with The Night Before Christmas, published in the 19th Century.  I was under the impression that at the time Trevithick was a boy Santa would be more commonly known as Father Christmas.
bad winters of '47 and '63:

p.37
Mexico Olympics: Summer olympics.  Why does Ace particularly remember them?  Did the UK win big? (Text submitted by Paul Andinach) Were there any notorious terrorist bombings?
Uncle Harry:
Hillman Minx: (Text submitted by Paul Andinach) Another of those tiny cars the British used to be so fond of. James Bond drove one once (in the 1958 novel Dr. No - obviously, it wasn't one of the films).  Later on in the book he regained his self-esteem by spectacularly crashing his 1935 Bentley while chasing Russian kidnappers, being captured and getting his nuts thwacked by an interrogator.
comforting trill of the film projector: Super-8 celluloid.  Superceded by videotape, it has no sound.
Mrs Crithin's tranny: Transistor radio.
'Those were the days, my friend.  We thought they'd never end.  We'd sing and dance for ever and a day...': (Text submitted by Paul Andinach) '...We'd live the life we choose. We'd fight and never lose. For we were young, and sure to have our way.' Chorus from "Those Were the Days", by Gene Raskin. According to the Reader's Digest Festival of Popular Songs, it was written in 1962, but was just catching on in England in the late sixties. (Note the nostalgia theme.)

p.38
The Doctor wonders about stopping, and letting Ace settle down.  Foreshadows 'Love and War'.

p.39
"Susan was my first travelling companion.": Glosses over the granddaughter bit.

p.40
"Far from the madding crowd.": (Text submitted by Paul Andinach) Title of Thomas Hardy's first really famous novel. I've never read it, so that's all I can tell you. (Text submitted by chocolate pilchards)  book set in the bleak 'Wessex' moors, by Thomas Hardy.
like that old woman in the Agatha Christie books: Miss Marple.

p.41
"Here's two bob, get yourself to the pictures?": A bob is a shilling, which is twelvepence before currency decimalisation in 1972.  Ace figured out her pre-decimalised currency in 'Remembrance of the Daleks'.

p.45
meeting the man with whom she would soon conceive little Dorothy: According to Will Cameron's website (see main page) Ace was born August 20th, 1969.  Sophie Aldred was born August 20th, 1962.  So yeah, at Christmas 1968 Ace is just being put in the oven.
Sharon Tate: Murdered, with six friends, by Charles Manson's cult on August 9, 1969.  The reference to Roman Polanski and Manson is explained.  Polanski directed Rosemary's Baby (1968) and Chinatown (1974).  Manson pops up again in 'The Left-Handed Hummingbird' and 'Dead Romance'.

p.46
Morris Oxford: (Text submitted by Paul Andinach) A car. Like a Morris Minor, only larger and roomier.
red-lettered ABC sign: do-it-yourself lettering, like at petrol stations.

p.47
You Only Live Twice: was released in 1967.
"Sorry, Mr Bond,": Come on, the perfect line would be "Goodbye, Mr Bond."

p.48
Gannex mackintosh: (Text submitted by Paul Andinach) Gannex was a weatherproof fabric manufactured in the former Crossley Mill at Elland by Joseph Kagan and used in the production of raincoats - famously for the late Harold Wilson. So it says at http://members.aol.com/calderdale/

p.50
For a moment, he saw himself balanced on the slippery walkway of another telescope: 'Logopolis'.

p.52
traces of Enstatite: (Text submitted by Paul Andinach) Enstatite is magnesium silicate (MgSiO3). The significance of its presence escapes me.

p.54
"Especially that one where you found those things in the ground.": Really borrowing from Nigel Kneale's Quatermass and the Pit.
the Rayner sisters are going to their family in Birmingham.  Mr Dutton, Mr Bollard and Mr Messingham..."  "The Unholy Three?" (plus Mrs Holland) : Possibly name-dropping here.  (Text submitted by Paul Andinach) Jac Rayner, audio NA scriptwriter extraordinaire, springs immediately to mind.  Simon Messingham is the author of 'Strange England', 'Zeta Major' and 'The Face Eater'.  In the acknowledgments of the latter, Messingham credits a Tim Bollard as the "nightmare angel of the expressway".

p.55
Like the mass grave he and his men had come across in Poland during the war: What were English soldiers doing in Poland?

p.56
'That's the way it is' by the Ink Spots:

p.57
His father hunched over a pools coupon as Peter Dimmock read out the results on Sportsview: (Text submitted by chocolate pilchards)  It's a way of betting on the football results during the football season (soccer).  Very big in the sixties, lost its way a bit because of the lottery in the UK now.  Still very much a ritual for those who do it.  You have to predict which games will be draws (no, really!), getting points for correctly predicting score and no-score draws.  Pools wins used to be like Lotto wins in the UK during their heyday.  The results would be read out as part of the football round up on the evening sports bulletins.

p.61
He was halfway through Bleak House, always one of his favourites, loving the way Dickens drew him into that murky, fog-bound world: Heh heh, a book within a book.
"That's very kind of you, Inspector."  "Sergeant.": Inspector outranks sergeant, IIRC.

p.63
when he presented Tales of Terror for the BBC Light Programme:
the GPO: General Post Office.  They handled telecommunications in those early days, and got the Post Office Tower named after them.

p.64
Victoria.  Outside the Cybertombs on Telos.  Talking about his family.  Sleeping in his memory.: 'The Tomb of the Cybermen'.

p.65
vellum-bound book: Vellum is the pages, more likely bound in leather.  Vellum is made from the skins of calves and lambs.

p.66
"One of the ruins that Cromwell knocked about a bit,": Mark Gatiss seems to have a soft spot for mid-17th Century English history.  His novel for the BBC Books is entitled 'The Roundheads', and deals with the execution of Charles I.  The first of the BBV Time Travellers audio adventures was 'Republica', about what would have happened if Cromwell's legacy had continued into the 20th Century.  And the Big Finish Doctor Who audio adventure 'Phantasmagoria', also by Mark Gatiss, takes place in Restoriation London.  Now about the parliamentarians defacing ruins, on p.103 of Antonia Fraser's Cromwell, the Lord Protector Cromwell and his troops are supposed to have most miserably defaced Peterborough Cathedral, its organs and glass windows at the end of April 1643.  She reports other incidents at Lincoln Cathedral and Ely Cathedral.The Puritans, you might recall, focused on the Bible and its message as the only really important religious noun, and all this finery and organs and stained glass windows and stuff were nothing but sinful graven images.
This great victory upon the moor of Marston: The tide of the civil wars of the 1640s turned for Cromwell and the parliamentarians in 1644, when the royalists were beaten at Marston Moor in Yorkshire on the 2nd of July.

p.67
Phillip Jackson:
Earl of Manchester: Manchester was on Cromwell's right flank at Marston Moor.
Prince Rupert:Prince Rupert of the Rhine (1619-1682), served both Charles I and Charles II as a soldier and a sailor. He was the third son of Frederick V, elector palatine, who by claiming the throne of Bohemia started the Thirty Years' War. Having gained military experience in Europe, Rupert joined his uncle Charles I in the civil wars and, following spectacular success as a cavalry officer, became commander in chief in 1644. A year later, however, a series of defeats, resentment of his harsh and imperious manner, and unjustified suspicion of treachery led to his dismissal. He and Charles I were partly reconciled, and he served the royalist cause as a naval commander until 1653. When Charles II was restored to the throne in 1660, Rupert returned to England and was later appointed admiral in both of the Anglo-Dutch Wars.

p.68
Earl of Newcastle:
Blood pumped from a wound in his neck: On p.126 of Cromwell, Antonia Fraser mentions the story that Cromwell was lightly wounded in the neck.  Cromwell's men were on the left flank at Marston Moor, and at one point during the stormy evening's fighting Rupert's bravest men charged him and the two sides ended up in hand to hand combat.  Cromwell was either clipped by one of his own men's pistols at close range, or nicked by the sword of Colonel Marcus Trevor, one of Lord Byron's men.  Trevor got the credit, and was made Viscount Dungannon after the Restoration of Charles II.  Cromwell is supposed to have left the field for a bit to get bandaged up at Tockwith.

p.69
Valentine Walton's boy dies: Walton was Cromwell's brother-in-law.  Apparently a cannon all but took his leg off.  Fraser reproduces the text of the relevant part of the letter Cromwell wrote to Walton.

p.70
Easter Association:
Sir Harry Cooke:

p.71
Ralph Grey:

p.72
Will Todd:
'Phantasmagoria,' said Cooke, waving his hand dismissively: Mark Gatiss' first production for the Big Finish audio adventures has been 'Phantasmagoria', starring Peter Davison and Mark Strickson.  It takes place in Charles II's London.

p.77
St Elmo's Fire: The ball of light which is sometimes seen around a ship's masts or yardarms during a storm.  Also known as a corposant.  Mark's other New Adventure is 'St Anthony's Fire', which is completely different.  Within months of 'St Anthony's Fire' Andy Lane wrote another one called 'All-Consuming Fire'.  It's rather confusing.

p.80
Frederick Storey:

p.81
'sit-ins' at the LSE: London Stock Exchange.
There were blacks everywhere.: I sense a reference to Enoch Powell coming on.
Oswald Mosley: Had Hawthorne watched his dream of a racially pure country vanish in a wash of feeble liberalism, or had he seen the pictures of the Holocaust?
All in all, Hawthorne seems more dedicated to a Nazi-type empire than the cosmopolitan British Empire.  Of course, even though the English were fair enough with natives of India, and even some of the Africans, it was a case of apartheid of a sort.  Visible minorities only started emigrating to the UK in large numbers in the mid-20th Century.  They were owed for having helped save the Empire from the Nazis.  Before the wars, even though Indians were British subjects with implications of the same rights as the English themselves, a shipload of several hundred Sikhs were forbidden from entering Canada at Vancouver for an entire summer.  They sat on their ship, the Komagata Maru, in Vancouver harbour, with little food or fresh water, occasionally attacked by police boats, and eventually forced to sail back to India.  Meanwhile Vancouver had grown by something like 50% in ten years and had a significant need for labourers.  Not too many people know about the Komagata Maru incident.

p.82
Uncle Remus: made into a hybrid live action-cartoon Disney film, The Song of the South, long before political correctness was invented.

p.83
Bellatrix: Gamma Orionis.  The left shoulder of Orion. Burnham's Celestial Handbook computes its distance as 470 light years,  It is a B2 Type star, a very powerful star 4000 times as luminous as the Sun.   On p.221 the nova's distance is given as a hundred and ten parsecs.  A parsec is the distance at which one Astronomical Unit (150 million km, the distance between the Earth and the Sun) has an angular width of 1/3600th of a degree, one second of arc.  One parsec is equal to about 3.26 light years, or 3.075 x 10¹³ km. The numbers don't quite correspond, with a 111 light-year difference.  But Burnham's isn't always right, and distance estimates have been revised since the Hipparcos parallax star-mapping space mission finished.
bone-white moon on its bed of stars: On December 23, 1968 the Moon was a waxing (growing) crescent.  It set at about 8:30 in Machester.  And Apollo 8 was well on its way there.

p.86
the whole white feather bit: In the early days of the War, some women walked around pressing white feathers on men who weren't in uniform.  Good on the women, they didn't have to go!
His ship was torpedoed in the Pacific: By the Japanese, then.  And some of them were still recovered alive, although the Pacific is a very big ocean, and didn't have major shipping route problems like the North Atlantic.  Incidentally, I've heard of an incident in the Pacific when an American ship went down just before V-J Day, and most of the crew were eaten by sharks before a rescue was organised.  (Text submitted by Stephen Graves) The USS Indianapolis was the American ship that went down. There’s a bit in  Jaws when the shark-hunter guy reveals that he was on that ship; the speech  is supposed to be one of the classic moments of the film.

p.87
"I'm Trevithick."  "The engineer?": The English engineer and inventor Richard Trevithick (1771-1833) built the first high-pressure steam engine and the first steam-powered carriage to transport passengers.

p.91
The next door bore the legend 'Vijay Degun' and a sign cannibalized from a cardboard 'Fragile - With Care' notice which now read 'agile - Wit...': Flair?

p.95
This Is Your Life!: A bit obvious, really, I've only seen the Sesame Street version with the table and the tree and stuff, but I hear that Peter Davison and maybe someone else were in the BBC version. (Text submitted by Paul Andinach) Jon Pertwee.  Hmm, and Tom Baker now.
Poor Jimmy Reynolds was dead: Possibly suicide, if he was gay.
they could tear up Grosvenor Square:

p.96
The Sword of Araby:

p.98
"White dwarf.  Double.  Hmm...you've got an exploding star on your hands.": A supernova is a star that explodes.  It suddenly increases in brightness by a factor of many billions, and within a few weeks it slowly fades.  In terms of the human lifespan, such explosions are rare occurrences.  In our Milky Way galaxy, for example, a supernova may be observed every few hundred years. Three such explosions are recorded in history:  in 1054, in 1572, and in 1604.
There are two common types of supernovas, called Type I and Type II.  Type I occurs among old stars of small mass, whereas Type II occurs among very young stars of large mass.  It is not known how a small-mass star can release the very large amounts of energy needed to explain Type I supernovas.  Scientists generally believe that this must involve binary systems--two stars revolving around each other.  In such a system one of the stars is a white dwarf, a small, dense star that is near the end of its nuclear burning phase.  After attracting matter from the companion star for some time, when the mass of the white dwarf reaches a certain limit it implodes, becoming a neutron star, and ejecting matter outward.  This rebound of matter is thought to be the supernova.  The limit is about 1.44 times the mass of the Sun, also known as the Chandrasekhar Limit.
Assuming we're still talking about Bellatrix, that particular star did not explode at Christmas 1968, not before nor since.  It's also not listed as a binary system in Burnham's.

p.104
sleeping rough: UK slang for homeless.

p.105
Abdication crisis: Edward VIII (1894-1972) was the only British monarch to abdicate voluntarily. As prince of Wales from 1910 until he succeeded his father, George V, on Jan. 20, 1936, Edward traveled widely and was very popular with British subjects in all parts of the empire. Soon after becoming king, however, he found himself at odds with the government of Stanley Baldwin over his determination to marry Wallis Warfield Simpson, (1897-86) an American divorcee. When it became clear that this marriage would not be accepted by either the political leaders or, probably, the public, Edward announced his abdication in a moving radio address on Dec. 11, 1936. Given the title of duke of Windsor, the former king married (June 3, 1937) Simpson and lived with her in France, except during World War II, when he served as governor of the Bahamas.  The abdication is covered in 'Players'.
Churchill's death: Sir Winston Leonard Spencer Churchill held most of the high offices of state in Great Britain, was a member of Parliament for more than 60 years, and served twice as prime minister.  He died on Jan. 24, 1965, 70 years to the day after his father, at the age of 90.
the date of the last election: On Oct. 15, 1964, when Labour won a narrow victory in the general election, Harold Wilson became prime minister. Hoping to increase his majority in the House of Commons, Wilson called an election for Mar. 31, 1966; Labour was returned with a large majority.

p.106
the Gabriel Ratchets:  Some kind of ghosts?

p.108
poster of Che Guevara: Ernesto "Che" Guevara (1928 - Oct.  9,1967, was a Latin-American guerrilla leader who helped Castro achieve his revolution in Cuba.  Argentinian by birth, he was trained as a doctor before becoming involved in agitation against the dictator Juan Peron.  He went to Guatemala, where he joined the leftist regime of Jacobo Arbenz Guzman in 1953. After Arbenz was overthrown (1954), he joined Castro in Mexico.  On New Year's Day 1959 they took the revolution to Cuba.
Guevara held several important posts in the Castro regime, including that of minister of industry .  In 1965 he dropped from public view; he had gone to Bolivia to train a guerrilla force.  In 1967 his group was destroyed by Bolivian forces near Santa Cruz, and Guevara was captured and executed.

p.109
Colour me Pop!: On colour television, I guess.
Brian Jones fringe: The Rolling Stones' first guitarist Brian Jones, died mysteriously in his swimming pool on July 3, 1969.  Very soon afterward the Stones played their memorable gig in Hyde Park.  July on 69 was a pretty intense month too, with Chappaquiddick, Apollo 11 and the beginning of Nixon's 'Vietnamization' withdrawal.

p.110
the Minster: York Minster, also known as the cathedral of St Peter, built between the 13th and 15th Century.
winding streets: As a well-preserved medieval city centre, there are parts of York that weren't built for automobiles.  The most famous is the Shambles, a street full of seemingly precarious Tudor frontages.  There are shambles in other historic towns like Chester, as well.  York also has an extensive network of back alleys called Snickleways.  They're not as sinister as they might sound, and there is at least one popular tourists' guide to them.
John Masefield and C S Lewis: The Herefordshire poet John Masefield (1878-1967), became the 15th poet laureate in 1930.  His volume of poetry Salt-Water Ballads (1902) and the long narrative poems The Everlasting Mercy (1911) and Reynard the Fox (1919) won him an enthusiastic audience.  He also wrote verse dramas and three successful adventure novels: Sard Harker (1924), Odtaa (1926), and Basilissa (1940).  Two early poems, "Sea Fever" and "Cargoes," are enduringly popular, but Masefield's work is now regarded as incidental to the major developments of 20th-century poetry, and his reputation has declined in recent years.  (Text submitted by Paul Andinach) And a couple of fantasy novels; The Box of Delights was done for television with Patrick Troughton in a key role.  CS Lewis, on the other hand, seems more timeless.
The scholar, science-fiction writer, and Christian apologist Clive Staples Lewis (1898-1963) led two virtually distinct--and equally successful-- careers as a writer.  The Allegory of Love (1936), written during his time as a fellow of Magdalen College, Oxford (1925-54), remains a standard work on medieval literature and the tradition of courtly love.  It was followed by other important critical and scholarly works, which include A Preface to Paradise Lost (1942) and English Literature in the 16th Century, Excluding Drama (1954).  In 1954 he was appointed professor of medieval and Renaissance literature at Cambridge University.
Lewis was known to a large public, however, as a persuasive and passionate advocate of conservative Christianity.  In a science fiction trilogy--Out of the Silent Planet (1938), Perelandra (1943), and That Hideous Strength (1945)--he placed the idea of Christian pilgrimage in a cosmic setting, portraying scientists as worldly tempters, blindly self-confident in their wisdom. His most brilliant work of Christian apologetics is perhaps The Screwtape Letters (1942;  rev.  ed., 1961), in which a seasoned old servant of the Devil instructs an apprentice in the art of capturing souls.  His purpose was to make the forces of evil look petty and contemptible.  As a children's author Lewis achieved enormous success with his seven Narnia fantasies.

p.111
'Born 12 May 1898.  Educated Repton School, blah, blah...': William Hartnell was born around 1907. (Text submitted by Paul Andinach) January 1908, in fact. The first Quatermass, on the other hand, was born in 1896. (Another Quatermass was born in 1901, and all the other Quatermasses were younger than Hartnell.)
Distinguished Service Medal: (Text submitted by Paul Andinach) "The Distinguished Service Medal is awarded to any person who, while serving in any capacity with the United States Army, has distinguished himself or herself by exceptionally meritorious service to the Government in a duty of great responsibility."  Not to be confused with the Distinguished Service Order, which is a British medal for meritorious service in war.
'Films include: Flames of Passion (1946), Sword of Araby (1949), The Man from the Ministry (1951), There's Someone in My Trousers! (1965): (Text submitted by Urac Sigma) Those film titles, especially the last two, are very typical British film titles of their era.
his delightful sparring with Gilbert Harding on What's My Line?: (Text submitted by Paul Andinach) "What's My Line?" was a TV game show in the fifties, hosted by Eammon Andrews. A guest with an unusual job would do a mime of their job, and a panel would attempt to guess what line of work they were in. Gilbert Harding was a regular panellist; so, presumably, was Trevithick in this reality.

p.119
On the radio, the Move were urging everyone to call the fire brigade:

p.120
Alastair Sim on the box: The most popular film version of A Christmas Carol.

p.125
Paleolithic quarrying: The Paleolithic Period, or Old Stone Age, is the earliest and longest stage of human cultural development, lasting from about 2.5 million to about 10,000 years ago.

p.128
fire at a chemical plant a few miles off and a few years back: I can't verify that for the moment.  Any Yorkshire people present?
"It is fatal to theorize without facts", eh Watson?":  Not sure which Holmes story in particular. (Text submitted by Paul Andinach) "It is a capital mistake to theorize before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts." Sherlock Holmes, in his first short story outing, "A Scandal in Bohemia".
With Victoria on the gas platform: 'Fury from the Deep'.
Jo in Llanfairfach: 'The Green Death'.
Tegan in London: 'Resurrection of the Daleks'.

p.131
Or maybe Brazil for the World Cup the year after: Pele, a soccer player who became one of the wealthiest and most famous athletes in the world, led the national team of his native Brazil to three World Cup championships (1958, 1962, 1970).  The 1970 championship match was played in Mexico City.

p.136
"I believe I'm a Paki to you, Dr Hawthorne.": With a name like Vijay Degun, he sounds a bit more Indian or Bengali than Pakistani.  Bangladesh separated from Pakistan in 1971.  West or East, Vijay is confirmed as Pakistani on p.151. (Text submitted by Urac Sigma) Actually, 'Paki' (used here) is a racial slur in Britain, used against someone of Asian (Indian/Pakistani/etc) extraction. So, regardless of where Vijay's ancestry lies, he's more saying, 'If you're going to call me a bad thing, at least call me the right bad thing.'

p.137
Ace thought of her Auntie Rose:
Carnaby Street: Centre of Swinging London.  Somewhere in Chelsea, I think.  Polly walked down 1990s Carnaby Street in 'Invasion of the Cat-People'.

p.139
"There was a bit of a mix-up.  All I got was a brown-paper parcel.  His uniform.  His boots.  And his little pocket book.  There was a bayonet hole through it.": That doesn't seem as much of a mix-up as an extremely sick joke.  It was probably procedure to bury soldiers in their uniforms, or at least leave them on until they could take stock of the dead.  Blood-soiled uniforms were probably burnt, and unsoiled effects auctioned off or put back into circulation with other soldiers.  And then you have to consider the machinery of war and how automatic letters of condolence were sent out and public lists made up.  A parcel containing Wilfrid's uniform would cost much more to post than a telegram.
"Pack up your troubles in your old kit bag...":
"While you've got a lucifer to light your fag...": Fag being a cigarette, but what's a lucifer?  A match, or a flare? (Text submitted by Stephen Graves) It’s a type of match. Both of the above lines are from a First World War  song by George Henry Powell, entitled, strangely enough, "Pack Up Your Troubles In Your Old Kit Bag." It goes like this, apparently:

1. Private Perks is a funny little codger
With a smile, a funny smile.
Five feet none he's an artful little dodger,
With a smile, a funny smile.
Flush or broke he'll have his little joke,
He can't be suppressed,
All the other fellows have to grin,
When he gets this off his chest, hi!

Chorus:
Pack up your troubles in your old kit bag
And smile, smile, smile.
While you've a lucifer to light your fag,
Smile boys, that's the style.
What's the use of worrying,
It never was worthwhile. So:
Pack up your troubles in your old kit bag
And smile, smile, smile.

2. Private Perks went a-marching into Flanders,
With a smile, his funny smile.
He was loved by the privates and commanders
For his smile, his funny smile,
When a throng of Bosches came along,
With a mighty swing,
Perks yelled out,"this little bunch is mine!
Keep your heads down, boys and sing, hi!
Chorus:

3. Private Perks he came back from Bosche shooting,
With his smile, his funny smile,
Round his home he then set about recruiting,
With his smile, his funny smile.
He told all his pals, the short, the tall,
What a time he'd had,
And as each enlisted like a man,
Private perks said "now my lad," hi!
Chorus.
'We're Gonna Hang Out the Washing on the Siegfried Line': (Text submitted by Stephen Graves) A Second World War song, this time. The Siegfried Line was a German defense line that ran along the German border. A bit like the Maginot line in reverse.
Considering the song was written in 1939, it was a little optimistic… The lyrics to the song are as follows:

"We’re going to hang out the washing on the Siegfried Line.
Have you any dirty washing, mother dear?
We’re gonna hang out the washing on the Siegfried Line
‘cause the washing day is here.

Whether the weather may be wet or fine
We’ll just rub along without a care.
We’re going to hang out the washing on the Siegfried Line
If the Siegfried Line’s still there.

Mother dear I’m writing you from somewhere in France,
Hoping to find you well,
Sergeant says I’m doing fine, a soldier and a pal
Here’s a song that we don’t sing, this’ll make you laugh.

We’re going to hang out the washing on the Siegfried Line.
Have you any dirty washing, mother dear?
We’re gonna hang out the washing on the Siegfried Line
‘cause the washing day is here.

Whether the weather may be wet or fine
We’ll just rub along without a care.
We’re going to hang out the washing on the Siegfried Line
If the Siegfried Line’s still there."

p.143
Powell was right.  'Rivers of blood,' he'd promised.  Rivers of blood.: As I figured at the beginning of the book.  The Conservative politician John Enoch Powell, (1912-1996), became known in the 1960s as a vocal opponent of nonwhite immigration into Britain and of British entry into the European Economic Community.  He became a junior minister in 1950, but after quarreling with the Conservative party's leadership, he resigned from the cabinet in 1963.  In 1974 he was elected to represent a constituency in Northern Ireland as an Ulster Unionist.  He lost the seat in 1987.  Incredibly, Tony Blair praised him after he died.  His 'Rivers of Blood' speech is the most notorious document which can be set against him, but I've never been able to find the text of it.

p.150
Camden Market:

p.152
"I love coffee, I love tea, I love the java jive and it loves me, eh?": It's a song called "Java Jive".

p.155
She thought of a word she'd found in a little yellow-backed novel in one of the TARDIS's less dusty rooms.  "The Doctor's... my mentor.":

p.157
Hammer horrors: Subgenre of horror films produced in postwar England by a certain production company.  Usually with Christopher Lee, Peter Cushing or Vincent Price.

p.160
The indicator went up to 27: I find it hard to believe that any radiotelescope has 27 floors of offices.  Even in 1968 they could hardly need more than ten floors for all the computers and a few engineers and technicians.  And it goes too far underground.  The crazy thing is, this book can be said to take place in Doctor Who's 27th season.  And Trevithick gets off the elevator on the 18th floor.  In 'The Pitch of Fear', of the comedy sketches produced for the Doctor Who special in November 1999, Mark Gatiss and David Walliams theorised than Season 18 was the point at which everything started to go wrong.

p.163
The creature was instantly consumed by fire: Caught in the explosion of a carbon dioxide fire extinguisher, fire might be the last thing one might expect.  It's more likely to be torn apart by shrapnel and flash-frozen.

p.164
antimacassar: There used to be a popular kind of hair oil called macassar, and an antimacassar is a special mat to put on the tops of comfy chairs to protect the upholstery from the oil.

p.165
A chamber with a secret door, the key to which he had stolen: Back to the prologue.
"Grandfather?" said the girl, giggling.  "Where have you been?": Odd, Susan was left out of the prologue.

p.167
Dalek-ravaged London: 'The Dalek Invasion of Earth'.
one brief meeting, during the Borusa incident: 'The Five Doctors'.  But surely, since there were four different incarnations of the Doctor in the Death Zone, the Doctor has actually met Susan four times since she left the TARDIS.

p.173
fo'c's'le: The front bit of a boat.  The author may be using some kind of repetetive nautical imagery, what with yardarms and St Elmo's Fire, and now this.  But he's from Darlington, one end of the first train line in the world.  How come there are no trains in this book?
Old Mr Pemberton at the post office: Could be a reference to the author of 'Fury from the Deep', simply because this is another 'under-siege' plotline.  Pemberton also wrote 'The Slide', a Quatermass-inspired radio play with Roger Delgado about evil-minded mud. (Text submitted by chocolate pilchards)  perhaps also a reference to one of his fellow League of Gentlemen guys. Steve Pemberton.  It's all about the Pembertons...

p.175
the earring Ace had picked up on their visit to Segonax: 'The Greatest Show in the Galaxy'.

p.183
two globes of nitro-nine-A: Terrance Dicks' special variant on the typical Nitro formula.  Never seen again, except here. (Text submitted by Stephen Graves) Also, it’s mentioned in Illegal Alien that Ace is experimenting with a new form of Nitro-Nine, which presumably means Nitro-Nine-A. Worth noting because it’s about the only piece of evidence that definitively places the Perry/Tucker novels before the Virgin NAs.

p.184
Sergeant Drew Smith and the parachute team he had brought to Perivale Youth Centre one wet bank holiday: Just for a display then, not a demonstration.  But Horsenden Hill ('Survival') is a great landmark, and a popular kite-flying spot.  I bet parachutists have used it as a target in the past.

p.186
Dicky ticker: bad heart.

p.187
dislocated the Doctor's right shoulder: Lucky.  The Doctor's left shoulder conceals a huge nerve bundle that can act like a tiny brain ('The Left-Handed Hummingbird', 'No Future', IIRC) and falling on that could have paralysed him.

p.188
"that Sentience... is of incalculable age.  I believe the Earth formed around it.": In I, Who Lars Pearson connects this statement with the end of 'Venusian Lullaby', when the Sou(ou)shi escape Venus bound for Earth.  I think it's not quite right, because the Earth already existed when that story took place 3 billion years ago.  The Sou(ou)shi are just a vampiric race like Axos that escaped the Time Lords and continued to become one possible source for vampirism on Earth.  On the other hand, the Sou(ou)shi were offering to kill the Venusians with their pleasant memories, and the Sentience appears to be a similar kind of psionovore. Check p.217.

p.190
China, India, Africa or even America, which sounded so exciting in the Conan Doyle books: Not that bewildering, I admit.

p.193
"Like the letters in Blackpool rock?": Rock candy, which it begins to irritate me has been referenced in what seems like almost all of the early New Adventures.  Letters are presumably imprinted into the candy. (Text submitted by chocolate pilchards)  incredibly sweet pink and white sweet.  Long sticks of it are sold at seaside resors, with letters printed right the way through it.  The sweet is round and cut off at the ends, meaning you can read the message printed in it.
"Like that French chap and his teacake!":

p.194
Cyril Cockayne: If Mark is a friend of Peter Anghelides, he might know that one of the supporting characters in Anghelides' 'Kursaal' is Bernard Cockaigne, if I've spelt it correctly.

p.198
"He's not called Doctor Martini, is he?":

p.211
"Remember Gabriel Chase?": 'Ghost Light'.

p.214
that nasty boy Chad Boyle: 'Timewyrm: Revelation'.

p.216
That first visit to Revolutionary France: referenced in 'An Unearthly Child' and 'The Reign of Terror'. (Text submitted by Stephen Graves) And covered in more detail in 'Christmas on a Rational Planet'.
Fleeing through the forest: Serial A.
The months in China with that Venetian traveller: 'Marco Polo'.
the deadly radiation of the planet Skaro: Serial B.
John Smith and the Common Men: John Smith is "The Honourable" Aubrey Waites, who started off with a band as Chris Waites and the Carollers.  They went from nineteen to two in a week in 'An Unearthly Child'. (Text submitted by Paul Andinach) The title "Honourable" means that the gentleman in question is the son of a peer (earl or lower; sons of higher-ranking peers get different titles). Calling his band the Common Men was, therefore, probably somebody's idea of a joke.
"One day, I shall come back.": 'The Dalek Invasion of Earth', and 'The Five Doctors'.

p.221
"About a hundred and ten parsecs.": Vijay isn't being exact about that distance; in 1968 methods of determining astronomical distances were (and, admittedly, are) rather primitive.  I should hope so, too; the implication is that the light from the nova took about 350 years to reach Earth, and 350 years ago was the Battle of Marston Moor in 1643.  1968 - 1644 = 324.  The only bit that doesn't add up is extratextual, the 470 light-year distance published in Burnham's.  And the fact that Bellatrix did not go supernova at Christmas 1968.

p.226
"M31.  The great spiral.": Burnham's Celestial Handbook, printed in 1978, notes that since the individual stars of Andromeda were resolved in 1923, there have been over a hundred observed novas, and possibly more than 30 occur every year.  It makes a special note of a supernova observed in 1885, now called S Andromedae, which was almost bright enough to see with the naked eye although it was 2 million light-years away.  That could have been the supernova the Sentience headed for next, as Burnham's doesn't make note of any other Andromedan supernovae.

p.228
Ian Brown and the Stone Roses: Better explained in the guides to Paul Cornell's books, 'Timewyrm: Revelation' and 'Goth Opera'.  Briefly,  a late 1980s rock band.
"The Elizabethans thought nostalgia was a diagnosable disease.": (Text submitted by Paul Andinach) This is true, although not actually all that relevant to this novel, since the listed symptoms of the "disease" they called nostalgia are those of what we'd now call homesickness.

p.230
Poison gas, they said, from under the ground: Not so ridiculous, when one considers Commander Millington's Well of Vergelmir from 'The Curse of Fenric'.  That was on the North Sea coast near Whitby, not fifty miles away from Crook Marsham.