Incongruous for the year, but the route and livery look right. However, closer inspection reveals this has registration plate JBD928, which was new in 1954 as United Counties 928. This and sisters JBD967 and JBD982 were exported to Canada and used by the Toronto Transit Commission on sightseeing tours between 1974 and 1977. Equus was in fact filmed in Toronto. The advert on the back looks right, and the conductor has a National Bus Company uniform with a square NBC badge. I'd be interested to confirm whether DD10 was the fleetnumber with Toronto TC, though:
