(1965, Eric Sykes, George Cole, Julia Foster, et al)

Absurd film features a father who builds a replica of the Old Bailey in his living room, while his son collects 'speak your weight' machines.
The opening credits feature an Eastern National Bristol Lodekka FLF in coach livery, while a London Transport AEC RF is barely seen in this still from a YouTube recording:

The camera is passed by three standard London Transport Routemasters in quick succession, RM1256 (256CLT), RM1518 (518CLT)(?), RM1400 (400CLT)(?)

London Transport RT2464 (KLB843) pulls up to take on passengers:

A Bedford VAS - owner unknown:

Another RT - this appears to be Craven bodied RT1420: