The Crown dependency of Guernsey is outside the United Kingdom and the European Union, and its islands have registration marks that are different from those used in the UK.

An oval containing the letters GBG (Great Britain and Northern Ireland – Guernsey), the island's international vehicle registration code, is sometimes included.

Guernsey hire cars sport a black 'H' on a yellow background on a separate square plate.

[4]Registration plates of Alderney are issued with the prefix 'AY' followed by a space and then one, two, three or four digits (as seen in the photo on the side).

[6] Before the Second World War registration were issued at the Island Hall by the Island's Government, the States of Alderney;[citation needed] following the 1948 Agreement driver and vehicle licensing was delegated by the States of Alderney to the Guernsey Government as one of the "transferred services"; thus motor vehicle registrations are now issued by the Guernsey Government upon application to the General Office of the States of Alderney at the Island Hall in Alderney.