This is really a traction engine film, but there is footage of a London Transport RT on service 36 in Park Lane. (thanks Colin Read) "Also scenes at Woburn Abbey steam rally with various background shots of contemporary Duple bodied lightweight coaches and a red/grey Burlingham Seagull." (thanks Jon Price). Perhaps even more remarkable (and bizarre) is the footage of a Handley Page Victor V-bomber. It's playing the part of a futuristic airliner!