Hell Drivers

Two photos on your website showing Stanley Baker crossing a (London) street in Hell Drivers but where is it?

A 657 Trolley Bus passes by in this scene. The route for the 657 was Hounslow - Sheperds Bush however I dont recognise the location as being anywhere between these two places. Is it possible that the bus changed its number (simply a few cranks of a handle inside) for the scene and it was filmed elsewhere in london?
Bob Trimmer