Visa policy of the United Kingdom
The visa policy of the United Kingdom is the policy by which His Majesty's Government determines visa requirements for visitors to the United Kingdom and those seeking to work, study or reside there. The visa policy of the UK also applies to the Crown dependencies of Guernsey, Jersey and the Isle of Man, which each operate their own immigration enforcement and have separate work permit systems.
Source: Wikipedia — Visa policy of the United Kingdom (CC BY-SA 4.0)