Found these lad’s while searching for parts, they are partners with LP Williams who do the spares while they concentrate on Parts manuals and owners manuals. They have a very good range, covering not only Triumphs, but also BSA and Norton.

I bought the Parts Catalogue Supplement hoping it would give me the drawings that were missing from the original manual, the supplement gives me a couple more drawings, the complete front wheel and some of the fittings. I’d hoped there would be more but will keep searching.