Reality: Famous And Fighting Crime, C4, 9pm

A real mixed bag of celebrities – Katie Piper, Penny Lancaster, Jamie Laing, Sandi Bogle and Marcus Brigstocke (all above) – volunteer as special constables with Cambridgeshire police force in this new four-part series. Tonight, the gruelling first-day training forces Penny to confront demons from her past and serves as a rude awakening to everyone else of the dangers they’re about to face.