Right of abode in the United Kingdom
The right of abode (ROA) is an immigration status in the United Kingdom that gives a person the unrestricted right to enter and live in the UK. It was introduced by the Immigration Act 1971 which went into effect on 1 January 1973. This status is held by British citizens, certain British subjects, as well as certain Commonwealth citizens with specific connections to the UK before 1983.
Source: Wikipedia — Right of abode in the United Kingdom (CC BY-SA 4.0)