A former London Transport AEC Regent III RT loses its roof. Two RTs were used in the film, RT246 and RT2513.
"RT246 had its upper deck removed and refitted on rollers to facilitate its easier deroofing for the bridge scene.
Incidentally this part of the film was shot in Jamaica for which RT246 left Pinewood for Liverpool Docks on 19 September 1972 en route out there. The upper deck of RT2513 was taken as a spare in case of a second take! A wooden mock up of the roof was used for the scene when it was on top of the chasing police car.
I saw a single deck RT2513 left at the Studios which I assumed was later scrapped." (thanks Maurice Bateman)