The Grand Knockout Tournament (colloquially also known as It's a Royal Knockout) was a one-off charity event which was shown on British television on 19 June 1987. It followed the format of It's a Knockout, a slapstick TV gameshow which was broadcast in the UK until 1982. The event was staged on the lakeside lawn of the Alton Towers stately home-cum-theme park.

Prince Edward, Duke of Edinburgh
as Self

Andrew Mountbatten Windsor
as Self

Anne, Princess Royal
as Self

Sarah Ferguson
as Self

Prince Richard, Duke of Gloucester
as Self

Rowan Atkinson
as Lord Knock of Alton

Barbara Windsor
as Lady Knock of Alton

Paul Daniels
as Chief Judge

Guy David Innes-Ker
as Self

Gerald Cavendish Grosvenor
as Self