These pictures were taken some time between the time ACSS was given to The Shuttleworth Collection by DH (around 1965 I believe) and the time the restoration of ACSS was started (late 70's/early 80's).
I think the shot was taken at Old Warden in what is now hangar 1, where most of the engineering now takes place. From what I know most of the current buildings south of Hangar 1 did not exist then. Note the construction on some of the other pics!
I was not there but the phots I have seen suggest the place was very different then!