There is an early interior scene - I'm open to offers on the vehicle:
A night scene features this Bolton Leyland Atlantean:
"This was shot in Bolton and shows Hayley Mills travelling on a Bolton Leyland Atlantean (one of the first batch, reg nos. UWH185-199). It shows route 35, destination Barrow Bridge. It is in the Darcy Lever/Withins area of Bolton (Barrow Bridge is not and route 35 went to Horwich - the opposite end of Bolton !!!)" (thanks Stuart Parkinson). This Atlantean (looks like 190, UWH190) has a conductor; the half-cab seen through the window is I guess a Leyland Titan.
Stuart adds: "in one scene, Hywel Bennett goes to visit a marriage guidance counsellor and is seen entering the Town Hall. This is filmed in Rochdale and in the background there is a AEC Regent V with Weymann body and an AEC Reliance with BET style dual door bodywork, both from Rochdale Corporation."
"Good shots of Bolton Atlanteans and I think an interior scene on a full-front Leyland Titan PD3." (thanks Mike Keeley)