A brief history of the recent changes.
When Brexit came into force (January 2021) the old-style GB Stickers and the GB number plate ones with the Euro Stars flag were no longer valid and everyone driving in France and beyond had to have the plain white GB Sticker on their vehicles and trailers.
Your number plates could no longer have the GB letters with the EU Flag around it and had to be replaced with the Union Jack and the GB letters. Just a few months later the rules changed yet again.
If you are annoyed that it isn’t that long since you went to the expense and trouble of ordering new number plates and or GB stickers, spare a thought for people like us who literally threw thousands of them into landfill on the 28th Sept 2021!
So from 2022 onwards any UK motorist (In a UK registered vehicle) is required by law to display the new country of origin identifier. This is now a UK sticker.
The official size is 18cm wide by 13.3cm tall. Some suppliers sell smaller ones because they look less intrusive on the car but they are not legal. I guess the police would need to be pretty petty to get a tape measure out, but never put it past them.
If you want to just have a
number plate sticker, which is a lot smaller and less intrusive, you could opt for a set of those. Though they are legal in France to have on their own they are not in Spain, Malta or Cyprus. They insist on a full sized one even if you have a UK number plate sticker.
These rules apply whichever country outside the UK you are driving so that means not just France or mainland Europe.