In the opening scenes a Bristol Lodekka FLF with Eastern Coachworks body is part of the 'London' backdrop:
The open top double decker aboard which Burt Bacharach plays piano is NOT as I'd believed a 1965 ex Bournemouth Daimler Fleetline with Weymann body - it's actually a 1966 Daimler Fleetline with Alexander body new to Trent, fleet number 486. Registration number is HRC486D - check out this shot:
Apologies for this; I've only just seen this scene in any detail; in fact the Weymann bodies of the Bournemouth Fleetlines were built to the Alexander design, so outwardly look very similar.