The Film & Video Institute(IAC) - national organisation for amateur film-makers.  Website: http://www.theiac.org.uk (lots of useful information plus lists of IAC Groups throughout the country)

Yorkshire Arts -
Website: www.arts.org.uk (Take 2 is their very useful magazine for photographers and film-makers)

Doncaster Movie Makers - website: www.moviemaker.fsnet.co.uk (very friendly club of which Pip & John Townley are Members)

Useful website covering butterflies -
an American site so most butterflies will be different fom UK but useful articles on gardening to attract butterflies etc.: www.butterflywebsite.com
General Links
The British Society for Underwater Photographers - www.bsoup.org

Looking for equipment? http://uk.pricerunner.com offers advce on choosing equipment and use their serach engine to find the best prices.

Want news from other low and no budget filmmakers? Register with this emailing group www.shooting.people.org

www.birdguides.com provides all kinds of services and info re wild birds, including feeders and food as well as birdwatching sites (based in Sheffield)
Ever wanted to make your own sound effects? Go to www.filmsound.org

www.findsounds.com can provide you with just the sound effect you are looking for

Young filmakers among us should enjoy www.dainter.com
Wildlife Video Bar t'at
filming locations    organisations, clubs & groups    
competitions & festivals    funding & grants    links  
equipment & resources      
about the Yorkshire Wildlife Video group   
home page
www.homestead.com/biggmarketfilms/freefilmhelp.html
useful bits, particularly form templates for filmmakers
NERIAC is the Regional Organisation that covers all IAC film and video groups from the Humber up to the Scottish Border (IAC is The Film & Video Institute) www.neriac.co.uk

Video, audio, computer and digital gear at good prices and with good service at http://www.aprvideo.co.uk  
Doncaster Video Group - a friendly club with informal meetings, concentrating mainly on video editing.  The club can advise on any video related subject and even have a TV and Video Egineeers as a Member.  Website: www.dvgroup.co.uk