The appropriateness of a Princess Diana documentary has been questioned by the Conservatives.

The Channel 4 documentary Diana: The Witnesses in the Tunnel features graphic images of the car crash that killed the Princess of Wales.

The show which is due to be aired on June 6 includes photographs taken by French photographers immediately following the collision.

Channel 4 told The Observer that it did not believe the images were intrusive.

However, the Shadow Culture Secretary Hugh Swire said that Channel 4 needed to remember that Diana was a mother.

He said: "This kind of coverage must be deeply distressing to Princes William and Harry.

"We would expect more from a public service broadcaster than showing sensational material in this way. The best thing Channel 4 can do for the British public and Diana's family is simply not to broadcast this programme."