Green’s Dictionary of Slang

twopence, esp. as a euph. used by the lowest ranks of prostitutes.

1909

J. Ware Passing Eng. of the Victorian Era 249/1: Tram-fare (London Streets’, 1882). Two pence, Until the toll over Waterloo Bridge (London) – one halfpenny – was abolished, the lower women of the streets used to ask for coin to go over the bridge.