Look at Life: City of the Air
(1964, Rank)
Footage of London Airport in the days before it was renamed Heathrow Airport, when much transport was provided by a fleet of BEA AEC Regal IV deck and a half coaches:
We also see some of the articulated tractor/trailer units used at the time:
The green/cream coach following the Royal Blue Bristol is too distant to identify:
This Duple-bodied coach appears to be in Rickards livery:
Too distant for clarity, but there is much variety here, including BEA AEC Regal IVs, a Duple Britannia, a Duple Continental, and even a Harrington Crusader: