Natasha Hamilton, Sinitta, Liz McClarnon, Scott Mills, Chico, Huw Stephens, Faye Tozer, Ian 'H' Watkins

Radio DJs and presenters including Scott Mills and Anneka Rice take part in the quiz.

Alexander Armstrong and Richard Osman present a special celebrity Radio 1 and Radio 1Xtra edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Featuring Clara Amfo and Trevor Nelson, Yasmin Evans and Greg James, Chris Stark and Scott Mills, and Dev Griffin and Sarah-Jane Crawford.

A radio-themed edition featuring Johnnie Walker, Sally Boazman, Stuart Maconie, Elizabeth Alker, Scott Mills, Chris Stark, Vick Hope and Harriet Scott.