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.
| Actor | Role |
|---|---|
 Prince Edward, Duke of EdinburghSelf | Self |
 Andrew Mountbatten WindsorSelf | Self |
 Anne, Princess RoyalSelf | Self |
 Sarah FergusonSelf | Self |
 Prince Richard, Duke of GloucesterSelf | Self |
 Rowan AtkinsonLord Knock of Alton | Lord Knock of Alton |
 Barbara WindsorLady Knock of Alton | Lady Knock of Alton |
 Paul DanielsChief Judge | Chief Judge |
| GGuy David Innes-KerSelf | Self |
| GGerald Cavendish GrosvenorSelf | Self |
 John CleeseSelf | Self |
 Jenny AgutterSelf | Self |
 Anthony AndrewsSelf | Self |
 Michael BrandonSelf | Self |
 Ben CrossSelf | Self |
 Sheena EastonSelf | Self |
| TTom JonesSelf | Self |
 Margot KidderSelf | Self |
 Kevin KlineSelf | Self |
 George LazenbySelf | Self |
 Hal LindenSelf | Self |
 Gary LinekerSelf | Self |
 Nicholas LyndhurstSelf | Self |
 Meat LoafSelf | Self |
 Jennifer O'NeillSelf | Self |
 Michael PalinSelf | Self |
 Christopher ReeveSelf | Self |
 Cliff RichardSelf | Self |
 Jane SeymourSelf | Self |
 Helen ShaverSelf | Self |