I must start offering to do paid research in London! A quick search of the Archives revealed just three interesting files but I think others have picked over them before. You can order paper copies remotely by the way for air mailing.
http://www.nationalarchives.gov.uk/s...&x=39&y=11&j=t
The IWM has a massive photo collection and so much of it is not online. The KID [Kidbrooke, as in Ministry of Supply, SE London depot] has a huge selection of photos including CMPs for instance and there must be more GPAs etc. in there. However I am sure that others have already done the same...perhaps anyone who has can come for'ard please?