French and Saunders film Harry Potter spoof for Comic Reilef.

Comedy duo Dawn French and Jennifer Saunders are to star in a sketch called Harry Potter and The Secret Chamber Pot of Azerbaijan.

The spoof will be a highlight of BBC1's Comic Relief night on 14th March and will feature an all-star cast. Dawn will play Harry, while Jennifer will play Harry's chum Hermione Granger.

Jeremy Irons plays Professor Snape, Basil Brush, Dobby the elf and Ronnie Corbett as the giant Hagrid. Directing the spoof is Jennifer's husband Adrian Edmondson.

Speaking to Teletext, Adrian said: "It's an all-star cast. Jeremy Irons is in it, and I had no idea he was such a good comedy actor.

"What great casting. Meeting Basil was a high point of my career. He is a genuine person."