London: Rolf Harris has written a song from his British jail cell mocking his victims as money-grabbing "wenches".

In a letter obtained by The Mail on Sunday, the disgraced Australian entertainer said his victims were "joining the feeding frenzy" by getting their "hooks into his dough".

The letter, allegedly written by Rolf Harris behind bars, was handed to The Mail on Sunday. Credit:Getty Images

He also said his life behind bars was "no hardship really".

The 85-year-old was handed a six-year jail term last year for a string of sex attacks on girls as young as seven.