Thanks for the reply OUAQUKGF. That would fit in with the earlier photo, with the Britannia Brit behind parked on the hangar side of the apron. Looks to be roughly where the minitower stands now. It only seems to have flown a dozen or so times in 4 months. Still can't trace when it departed back to its usual base at Biggin. The Keegan logo - presumably a sticker - seems to have gone by the time of the Biggin Air Fair in May 1967. Wikimedia has a similar picture :-
https://commons.wikimedia.org/wiki/F...081991650).jpg