Quote

Thinking of taking a road trip away from the United Kingdom this Autumn or later? Allow us to chuck in an unexpected (but not especially arduous) complication: that GB sticker/magnetic plate you were going to slap on the boot of your car will no longer be valid.

The GB designation that’s been in use for 111 years will be switched to ‘UK’ from late September. If you have a number plate with GB printed on it, meanwhile, you’ll need to run a UK sticker in addition, or order one of the new UK plates.

https://www.carthrottle.com/post/gb-stickers-wont-be-valid-for-driving-abroad-from-september/

I object - How dare the United Kingdom advertise itself on my registration plates without my permission!!