Charlize Theron and Carey Mulligan have been tipped for the lead role in a 30-million-pound film about Princess Diana, which will be based on the years before her divorce from Prince Charles.

Charlize Theron, Carey Mulligan and Princess Diana

The film to be produced by Stephen Evans, who has scored success with The Iron Lady about former Prime Minister Baroness Thatcher, will be made on the basis of Diana's bodyguard's memoirs. Evans said he wanted to show the world the truth behind what happened to Diana, who would have turned 51 this year, before her 1996 split from her husband.

It will be told partially from the point of view of Ken Wharfe, who could be played by Ewan McGregor. Wharfe was trusted to look after her sons Princes William and Harry, who called him 'Uncle Ken', and released a controversial book called 'Diana: Closely Guarded Secret' in 2007.