Pennies From Heaven (BBC mini series, 1978)

Ground-breaking musical drama set in the 1939s and written by Dennis Potter and starring Bob Hoskins. Episode 3 includes London footage of the era, with trams crossing Westminster Bridge and London Transport AEC STLs at Piccadilly Circus:
An AEC NS follows an STL, and an AEC LT crosses in front of the camera:
AEC NS1006 (XP8202):