TV presenter and model Katie Piper, Loose Women panellist Penny Lancaster, Made in Chelsea's Jamie Laing, Gogglebox's Sandi Bogle and comedian Marcus Brigstocke volunteer as special constables with Cambridgeshire police force. In the first edition, 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.
