(1965, The Dave Clark Five)

London scenes feature an AEC Routemaster on route 137, and another more distant:

Two Leyland RTLs, one on route 60:

Part of a Bedford SB/Duple Super Vega;

Both Nick Webster and Pete Sincock have noted an AEC Regent III, Pete adds “with a four bay rear entrance body (possibly Weymann). In the film it appears as the control tower of a go-kart track, and is in very good order, minus a few seats but all the glass is present. It is in what appears to be an unrelieved single colour.”

“This part of the film is set in Devon, possibly Dartmoor as the climax is at Burgh Island. The Burgh Island 'ferry' also features.”
So is this a Devon General Regent?