On 6 December 2023, the Government of the United Kingdom of Great Britain and Northern Island notified the Secretary-General of the extension of the application of the Agreement to the territory of Guernsey. (See depositary notification C.N.512.2023.TREATIES-XXVII.7.d of 18 December 2023)
On 22 March 2023, the Government of the United Kingdom of Great Britain and Northern Ireland notified the Secretary-General that its ratification of the Agreement would extend to the Crown Dependency of the Isle of Man as follows: "… the Government of the United Kingdom of Great Britain and Northern Ireland hereby extends the application of the United Kingdom’s ratification of the [Paris Agreement] to the Crown Dependency of the Isle of Man, a territory for the international relations of which the United Kingdom of Great Britain and Northern Ireland is responsible. The Government of the United Kingdom of Great Britain and Northern Ireland considers the extension of the [Paris Agreement] to the Crown Dependency of the Isle of Man to take effect on the date of deposit of this notification."
On 23 September 2022, the Government of the United Kingdom of Great Britain and Northern Ireland notified the Secretary-General that its ratification of the Agreement would extend to the territory of Gibraltar as follows: "... the Government of the United Kingdom of Great Britain and Northern Ireland hereby extends the application of the United Kingdom’s ratification of the Agreement to the territory of Gibraltar, for the international relations of which the United Kingdom is responsible. The Government of the United Kingdom of Great Britain and Northern Ireland considers the extension of the Agreement to the territory of Gilbratar to take effect on the date of deposit of this notification".
On 29 April 2022, the Government of the United Kingdom of Great Britain and Northern Ireland notified the Secretary-General that its ratification of the Agreement would extend to the territory of the Bailiwick of Jersey as follows : "... the Government of the United Kingdom of Great Britain and Northern Ireland hereby extends the application of the United Kingdom's ratification of the Agreement to the territory of the Bailiwick of Jersey, for the international relations of which the United Kingdom is responsible. The Government of the United Kingdom of Great Britain and Northern Ireland considers the extension of the Agreement to the territory Bailiwick of Jersey to take effect on the date of deposit of this notification".