If you’re in Spain, Cyprus or Malta, you must display a GB sticker no matter what is on your number plate.

In EU Countries other than the 3 mentioned above you do not need a GB sticker if your number plate includes the GB identifier on its own or with the Union flag.

You do not need to display a GB sticker to drive in Ireland.

Apart from the 3 countries mention above you must display a GB sticker clearly on the rear of your vehicle if your number plate has any of the following:

A Euro symbol

A national flag of England, Scotland or Wales

Numbers and letters only – no flag or identifier

For more information, including documentation requirements here is a link to the UK Government advice for driving and using UK vehicles in the EU

https://www.gov.uk/guidance/driving-in-the-eu#vehicle-registration-documents