Once upon a time, I had a link to a website that covered wartime fonts, skins and insignia.. that sort of thing. I've looked on my old PC and can't find it there.. I've also Binged the life out of this PC and nothing looks even remotely obvious. Can anyone remember such a site and if it still exists, post a link to it.
http://en.wikipedia.org/wiki/Royal_Air_Force_roundels I've found the colours to be a bit bright on this page especially if you do a 'Save As' on the image and try and use it directly on a paint but it's useful for layout and especially proportions.
http://www.rafweb.org/Menu.htm#Equipment This site is a mine of info for all things RAF related. Scroll down to the 'Equipment' section to see all the various paint schemes used, listed by Squadron number.