If you think Austin brakes lack bite....

[Duncan Grimmond]

A Tart Trap was a vinyl covered foam rubber pad curved on the underside to fit over a rear mudguard. With a pair of clamp-on footrests it provided a pillion seat for a young lady or, in vernacular, a “tart”.
If you were lucky and “clicked “ with a girl at the “caff “ you could offer her a lift home on the pillion seat...