Bruno Tonioli, Zoe Williams, Catherine Tyldesley

Ben Shephard invites Strictly judge Bruno Tonioli, TV doctor Zoe Williams and former Corrie actress Catherine Tyldesley to take part in a special edition of the quiz show, in which contestants answer questions to win turns on an arcade-style machine. Dropping tokens down a choice of four chutes, they hope to knock piles of them off a moving shelf - and the more they collect, the better their chances of collecting the ú20,000 prize for their selected charity.