Sir Martin Sorrell is the advertising mogul who took a small company called Wire and Plastic Products (they used to make shopping baskets back in the day) and transformed it into the biggest advertising company in the world. After leaving WPP in 2018, he set up S4 Capital — a new, data-driven, obsessively futuristic marketing company for the modern age. It is already worth more than £2 billion, and, in his own words, has left the traditional agencies looking like dinosaurs. In a brilliant episode of the podcast, Sir Martin talks about his role as the third Saatchi brother; about plans for retirement (spoiler — he doesn’t have any); and about how his grandfather cut off a cossack’s arm at the age of 10.