A Honeymoon Adventure
(1931 (Benita Hume, Peter Hannen, Harold Huth)
An inventor and his new bride are pursued by criminals on their honeymoon. London street scenes include an early rear entrance Green Line T-class AEC Regal:
Most of the other buses seen are roof only, but there is a glimpse of an AEC NS:
Our heroine is followed aboard an open top 'decker (it's a studio shot with back projection), but it's not identifiable: