Led by chief executive Robert Marr, 54, this London-based media group has made 20 acquisitions over the past 10 years, including a portfolio of brands from Centaur Media, bought last year for £5m. Metropolis publishes more than 35 business titles, including fashion magazine Drapers, and has diversified into paid-for and digital content, as well as live events. It also operates the consumer discount platform smartsave, which provides restaurant and attractions discounts in cities such as New York, Miami and London. International sales reached £10.5m in 2018.