In the UK, most forensic psychiatrists work for the National Health Service, in specialist secure units caring for mentally ill offenders (as well as people whose behaviour has made them impossible to manage in other hospitals). These can be either medium secure units (of which there are many throughout the country) or high secure hospitals (also known as special hospitals), of which three are in England and one in Scotland (the State Hospital, Carstairs), the best known of which is Broadmoor Hospital. The other 'specials' are Ashworth hospital in Maghull, Liverpool, and Rampton hospital in Nottinghamshire. Also, a number of private-sector medium secure units sell their beds exclusively to the NHS, as not enough secure beds are available in the NHS system.