Her Majesty's Prison Service (HMPS) is a part of Her Majesty's Prison and Probation Service (formerly the National Offender Management Service), which is the part of Her Majesty's Government charged with managing most of the prisons within England and Wales. (Scotland and Northern Ireland have their own prison services: the Scottish Prison Service and the Northern Ireland Prison Service, respectively.) It has its head office in Clive House in London, and previously its head office was in Cleland House in the City of Westminster, London.