The Uncle
(1965, Rupert Davies, Brenda Bruce, Robert Duncan)
Story of a young boy learning about life in Plymouth. City centre scenes have plenty of Corporation Leyland Atlanteans and Titans in the background:
One identifiable bus is Plymouth Corporation 162 (YCO262), a 1963 Atlantean/Metro-Cammell:
Another, which plays a bigger part in the movie, is 144 (VDR944), a similar example new in 1961: