With the mix of military and civil airframes I wonder whether these photos were taken at one of Charles Hughesdon's Helicopter Garden Parties at Ripley? I haven't flown in there since the 1969 event but somehow it seems familiar.
Hofmeister posted this Pathe News clip on this forum back in September 2010 and the tree type and maturity etc might possibly back up this supposition?
HELICOPTER PARTY - British Pathé