UK Immigration Service

The United Kingdom Immigration Service (previously known as the Aliens Branch and the Immigration Branch) was the operational arm of the Home Office responsible for frontline border control until its disbandment in 2007. It operated at airports, seaports, the UK land-border with Ireland and the Channel Tunnel juxtaposed controls. Its in-country enforcement arm was responsible for the detection and removal of immigration offenders such as illegal entrants, illegal workers and overstayers as well as prosecutions for associated offences. On its disbandment, Immigration Service staff were re-deployed within the short lived Border and Immigration Agency which was replaced by the UK Border Agency which, in turn, was replaced by three separate entities: UK Visas and Immigration, Border Force and Immigration Enforcement, overseen by the Home Office.