Martin Lewis of MoneySavingExpert has helped millions of people save money through consumer advice and big campaigns on bank charges and mis-sold PPI credit insurance. But now with the cost of living crisis, has he "run out of tools"? He grew up in a Jewish family in Cheshire. He lost his mother in an accident just before his 12th birthday, an event that had a lasting influence on him. He later became a journalist and financial campaigner, motivated by wanting to help others save money. The success of MoneySavingExpert made him a multi-millionaire. But the only thing that's flamboyant about him is his dancing style. He also loves Scrabble, even proposed to his wife over a game of it. He's obsessed with his daily step count, and has been known to hold meetings while on a treadmill. He's said to be the most trusted man in Britain - a heavy responsibility.

Presenter: Mark Coles Producer: Arlene Gregorius Researcher: Imogen Serwotka Sound: James Beard Production Coordinator: Janet Staples Editor: Damon Rose