Magnusson: Mastermind's long-running host

Experts

"I've always enjoyed watching it," said Anderson, who is best known for presenting Whose Line Is It Anyway? and Clive Anderson Talks Back.

"I think it really welcomes the viewer by encouraging them to side with one of the contestants.

"Of course there are always those who think they're the experts after answering one or two specialised questions. I think my own specialist subject would be the history of Arsenal FC."

Four contestants take turns in answering questions on their specialist subject and general knowledge.

Oldman will present a Saturday night show

Viewers with digital TV will be able to answer the general knowledge questions from their sofas - and those with the highest scores will be invited to take part in a viewers' final.

Oldman, who has starred in Hollywood films The Fifth Element and Air Force One, will present a documentary showcase called Filmreal.

The announcements come as the channel unveils its autumn and winter schedule.

"[The schedule] demonstrates that we're dedicated to challenging and stretching the boundaries of topical and factual television," said David Abraham, general manager of networks at Discovery Networks Europe.

The channel will also screen special theme weekends, starting with a host of programmes to commemorate the death of Elvis Presley.