Before this thread fades away, I thought I’d squeeze in one more picture. This was taken at Prestwick in Feb '47 - well, not exactly Heathrow but an airport from the same era.
Scottish Aviation had this old Fokker F.XXII at the back of their storage cupboard and brought it out in 1946-47 to build a service to and from Belfast. It didn’t last long. It might have been the economics, or maybe the noise. The power units were P & W Wasps so on every take-off this splendid beast made the same racket as a formation of Harvards.