Just come across this post over at the FlyPast/Key Publishing forum, taken by a chap on a visit to Duxford in the summer of 1968. Of course Duxford was a little different at the time; the production team hadn't quite accidentally blown up a hangar at that point, there was half a chateau, and a nice 1940 dispersal site...
Here are some cracking pics of it!
http://forum.keypublishing.co.uk/showthread.php?t=88871