Rugby union is one of the most popular sports, in terms of both participants and spectators in London. London has several of England's leading rugby union clubs, and the city is home to 13 teams playing in national leagues, and many regional amateur leagues regulated by the London and South East Division Rugby Football Union. However, several of these teams, due to necessity, have found homes at stadia outside the boundaries of the capital. The sport is well established, especially in the middle-class suburbs to the north and west of the city. Four of the twelve clubs currently in the Gallagher Premiership have London origins.