Bloody Kids
(1980, Derrick O'Connor, Gary Holton)
In one sequence a horde of kids take over a London Transport AEC RT. It's pursued rocking from side to side by a Ford Cortina, and there's some bumping between the two vehicles:
When it comes to a halt it's revealed as RT1400 (KXW499), a Saunders bodied example with a roofbox. It's not however in London Transport ownership and carries different fleetnames. Meantime the sequence ends with Holton's character jumping off the roof: