What a Crazy World (1963, Joe Brown, Sharon Maughan, Marty Wilde, et al)
Interesting mix of gritty East London drama and musical. An early street scene sees passing London buses; in the foreground seen from behind is RTL358 (KGU434). In the same sequence an unidentified coach is only partly seen.
Later, Alf (Brown) and his girlfriend Marilyn (Maughan) travel into Central London on RT2669 (LYR653) - good interior and exterior footage.
There's a scene where Alf runs into two of his friends, with RTLs passing in background, and another in a park with RTs and Bedford coaches in the distance.