To come back to the topic i would be very interested to know how recce could be done of GDR territory. For example wouldnt it have been possible to hide recce cameras in supply airplanes to West Berlin?
Unsure about that, but the RAF did have a number of aircraft flying to West Berlin over East Germany, I will do some research.
The reconnaissance we undertook was training all around West Germany, it was for the day when the Russians attacked

Saying that, I was there when all the RAF Harriers were shipped out for the war in the Falklands, a number of reconnaissance pods were also taken and recce missions were flown, with the Royal Navy processing and printing printing the film.
See
http://www.letletlet-warplanes.com/forum/index.php?topic=403.new#new and
http://www.geocities.com/Pentagon/Fort/2839/Barrie/Air-Reconnaissance.htm for some recce imagery of the war.
Of note is the only British POW of the war was an RAF Harrier pilot who I think was shot down as he undertook a reconnaissance mission.