Looks like this was filmed from the old Roof Gardens, a much loved feature at Heathrow Airport. I spent many a happy Saturday or Sunday afternoon there during my childhood.
Interesting to see, behind the southern runway, the 3 hangars with HUNTING in big letters, where my late father worked at the time this was filmed. They were occupied by Field Aircraft Services Ltd, a Hunting group company. The lettering originally said HUNTING-CLAN, an airline previously based there.
Ref; > "I Flew from LHR to Singapore on a British Eagle Britannia in 1966". Yikes, how long did that take?, in 1971 I flew from London to Melbourne on a Boeing 707 and it took 38 hours; we stopped everywhere from Zürich to Rangoon with four changes of crew: that was horrifying enough. :(
Probably totally wrong here but I’ve watched a few Heathrow videos from the 60s and I get the impression the planes taxi a lot faster. Or is that because the films speeded up?