Leave to enter is the permission given by British immigration officers for entry to the United Kingdom and the Crown Dependencies.
[2] Under the Common Travel Area provisions, Irish citizens do not require leave to enter or remain, unless they have been excluded from this right by the UK Government.
Leave to enter is required at any point of entry, including through the Channel Tunnel and the land border with Ireland.
Where required, entry clearance must be obtained from the UK Government in order to travel to any of the three territories.
[3][4][5] The Common Travel Area is an open border agreement between the United Kingdom, the Republic of Ireland, the Isle of Man and the Channel Islands.