Self-managed social centres in the United Kingdom can be found in squatted, rented, mortgaged and fully owned buildings. These self-managed social centres differ from community centres in that they are self-organised under anti-authoritarian principles and volunteer-run, without any assistance from the state. The largest number have occurred in London from the 1980s onwards, although projects exist in most cities across the UK, linked in a network. Squatted social centres tend to be quickly evicted and therefore some projects deliberately choose a short-term existence, such as A-Spire in Leeds or the Okasional Café in Manchester. Longer term social centres include the 1 in 12 Club in Bradford, the Cowley Club in Brighton and the Sumac Centre in Nottingham, which are co-operatively owned.