Section 25 were formed in Blackpool, Lancashire in April 1978 by brothers Lawrence and Vincent Cassidy, taking their name from a provision of the Mental Health Act which allowed for compulsory detention.

Unlike the majority of their obvious peers the group survived beyond 1982, and in 1984 not only scored an international dance hit but also synthesized acid house avant la lettre. Then they split.

The brothers Cassidy have revived the band in 2006.