(1966, Lynne Redgrave, Alan Bates, James Mason)

An early sighting of 7171NK, a 1961 Bedford SB1/HarringtonCrusader operating for Streets of Hertford:

Redgrave boards much-filmed London Transport RTL1050 (LLU829), blinded for route 16; it was by then was owned by Continental Pioneer of Richmond.

There's another view of a bus on route 73; this may well be RTL1050 again, since RTs had all but been removed from route 73 by the time the movie was made:

(thanks David Thrower)