Bradford 218, 6218KW, an AEC Regent V with MCW H40/30F body, new in April 1964, on driver training duties with soon to be replaced trolleybus 845 behind.
I guess that 218 is turning right, hence the mini-cooper about to undertake it.
Just behind the photographer was a turning circle where short workings of the 7 numbered 6 could turn.

Photo taken by David Mitchell, January 1972, Bradford Thornton Road, junction with Hoyle Ing Road / Spring Head Road