A patient in Broadmoor Hospital who has spent more than two decades alongside some of Britain's most dangerous criminals has won the right to have a review into his detention heard in public, The Independent has learned. The decision, which is thought to be a legal first, has major implications for the way Mental Health Tribunals function and will open the doors to one of the country's most secretive arbitration systems. The man, who cannot be named for legal reasons, has spent 23 years detained under the Mental Health Act, mostly at Broadmoor Hospital, the high-security facility in Berkshire that houses notorious offenders such as the serial killers Peter Sutcliffe and Robert Napper. He was committed in September 1986 after being convicted on two counts of attempted wounding. Doctors had classified the 52-year-old as having a mental illness and psychopathic disorder, but in September 2008 they changed the diagnosis to just a psychopathic disorder.