Toyah Willcox is to join the cast of ITV2's adaptation of the Belle de Jour novels, the story of a prostitute that evolved from a web blog.

Wilcox will play the mother of the main character, a London call girl, who will be played by Billie Piper. Cherie Lunghi is also thought be lined up to play the call girl's 'madam' or agent.

Filming on the 8-part Tiger Aspect and Silver Apples production starts this week and will premiere on ITV2 later this year.