(1949, David Tomlinson, Carol Marsh, Mervyn Johns et al)

Released in the same year as the Marx Brothers movie of the same name; this bonkers British screwball comedy concerns a wealthy socialite who can't stop hiccupping, and the efforts to help her. It opens with a very dark view of two RT family buses followed by two STLs at Piccadilly Circus:

More interesting (and symptomatic of the bizarre goings-on) is an extended sequence from the 1929 silent 'Would You Believe It!' starring Walter Forde, which includes a passing AEC NS:

There's also this small bus:

'Would You Believe It?' is a lost movie, and this is the only way you'll get to see any of it.