The UK is also closely linked with the Republic of Ireland; the two countries share a Common Travel Area.

Guernsey belongs to the Common Travel Area.

Ireland, along with the UK, is a member of the Common Travel Area.

Instead, a Common Travel Area exists between the two states and the Crown Dependencies.

In 2011, the first public agreement between the British and Irish governments concerning the maintenance of the Common Travel Area was published.

It is part of the Common Travel Area, allowing passport-free travel to and from the United Kingdom.

Jersey belongs to the Common Travel Area.

The Common Travel Area has meant that Ireland has been required to follow changes in British immigration policy.

There are no routine immigration checks on travellers arriving in the Isle of Man from another part of the Common Travel Area.

If the United Kingdom or Ireland were to join Schengen, the Common Travel Area would come to an end.