George observes: "In the early part of the film there are numerous shots of London's Routemasters also a lovely shot of an RML-class Routemaster from which the actor Bill Travers is seen alighting.
A scene outside Victoria main line station shows in the background FRM1 [KGY4D, the sole rear-engined Routemaster] leaving the bus terminus in public service."
There is also a sighting of a Red Arrow AEC Merlin, MBA169 (VLW169G)
....and this tantalising glimpse of Bristol LS/Eastern Coachworks JDL760 operating for Winlon, a West London dealer. It was new in 1953 as Southern Vectis.
Screencaps provided by stronghold.