Maybe off-thread, but I remember as a small boy in the early 1960s seeing Avro Yorks at Heathrow, in the glorious days when you could see the aeroplanes parked near the southern side of the airport where the cargo centre is now. I believe these were Skyways airline passenger aircraft, or maybe used for cargo. They were painted in a pale green/grey, maroon and silver scheme as I recall. I also remember the Air Canada DC-8 (or maybe Convair Coronado) which over- or undershot and ended up in a cabbage field south of the airport. There was also a regular flight by a Breguet Deux Ponts out of Heathrow , probably still into the early 1970s - that was a sight to behold; was it passenger or cargo?