All vehicles registered in the UK must display the international registration letters GB on the rear of the vehicle when taken temporarily abroad.
UK registered vehicles displaying Euro-plates (a circle of 12 stars above the national identifier on a blue background) don’t need to fix a GB sticker to the rear of their vehicle when driving in EU countries.
In non-EU countries, a GB sticker must still be displayed on the rear of UK-registered motor vehicles, caravans or trailers. Most motoring organisations and many tour operators will supply GB stickers.