Roller derby has been around since 1930 but its most recent incarnation, as an all-women, amateur sport – rather than the staged, theatrical show that it became in the 1970s – started in America a decade ago. The first British club, the London Rollergirls, currently ranked number one in Europe, was founded in 2006. Since then, the sport has exploded and there are now 79 teams in the UK. The Rollergirls’ last bout was watched by 1,300, and there is a six-month waiting list to join their junior recreational league.