Fashion guru Gok Wan, reality TV star Joey Essex and veteran presenter Valerie Singleton each want to improve their memories, so accept the challenge of a unique contest in which they must memorise hundreds of facts. The aim of the competition is to encourage them to master new memory techniques taught by world memory grandmaster Mark Channon. Gok Wan learns the periodic table. Valerie Singleton studies UK grime artists. And Joey Essex swats up on William the Conqueror. Whose memory comes out on top?