Whilst playing about with the "Document Search" form (which is a brilliant *tool, by the way) at Joe's
Pathfinder beta, I came across this collection of manuals:-
internetMEDOff-hand, I can't remember if they have been mentioned before.

@Huw:
this list could be in need of due review, Mate.
*
It searches on-line for manuals and (or) documents relating to the equipment concerned, then allows you to download and automatically poke them into the appropriate "box" (panel, pocket, pouch?) at the equipment page in view. In short it greatly simplifies what can otherwise be quite a laborious process (searching the web, downloading, renaming into a directory somewhere ... then - two months later - trying to remember where you placed it ... etc., etc.).
The Image Search facility gets a big Thumbs Up too. It searches the web for images (one of which you select) so you can insert a nice picture of the kit at top right of the main form. Very nice! And all quick and easy.