Most people know Andy Hamilton from his frequent (and very droll) appearances on panel shows such as Have I Got News For You and The News Quiz on television and radio, but he is also a prolific writer. His writing credits could take up the whole of this review, but a brief CV includes Not the Nine O’Clock News, Drop the Dead Donkey, Old Harry’s Game and, most recently, the equally excellent Outnumbered on BBC One, which he co-writes with Guy Jenkin. But now, with Hat of Doom, he is going back to where he started in comedy and doing a stand-up tour.