OK, I've got a box of documentation from the Nat. Archives.
For all you UK-Type-People, the National Archives at Kew is a pretty nice place. It has an Internet Cafe, a proper Cafe/Restaurant and a shop that seems to sell some WW2 books (amongst others of course). Well worth a visit if you want to do some research - but check the website first JIC.
I have scanned all the AVIA 18/691 (Westland Whirlwind) documents. They were originally foolscap so they're now scanned into A3 mulitple page TIFF files. There are 8 files, sizes vary from 300KB to 3.5MB. Some of the pages are poor quality though.
I'm not sure if I can process these any different, I still need to check what my home scanner can do. Let's see if the current files are OK as a source first.
Also, I have AVIA 15/580 documentation - but there's an awful lot of it and it needs sorting first.