Thanks for the replies folks, unfortunately still can't see Tiger_Mate's pic for some infinitely cunning reason.
Reckon that I must have seen a picture of the Manchester hangar in the past and my mind has superimposed it over that of the Hunting hangar at LHR, which I do now recall, full of HS125s, the Shell GII and, no doubt, Tim Mills' beloved Falcon 20s!
Research has revealed a Fairey hangar adjacent to the central area at Heathrow up to 1964, when it was demolished to make way for further development - think that
this may be it? Not that I recall it personally, I was born in '64!
Bof, totally agree with PPP, please share your photos of that era with us!
Which reminds me: I have two reels of 16mm cine film shot in the 1950s bearing the enigmatic scribble "LAP" (London Airport?) and "Air Display". I will hie them down to Jessops for transfer to VHS or CD.
Cheers
Treadders