The fine for not correctly displaying a UK car sticker is £120 (150 Euros) so to not buy one, which will cost less that £4 is bonkers. It would put a damper on your holiday and dent your spending money to have to fork out for an on-the-spot fine by police. The Importance of Adhering to Local Traffic Regulations
Simple things like UK stickers, headlamp converters
may seem insignificant but they can invalidate your car insurance if your car is not deemed to be road legal.
Ignorance of the law is no excuse. The majority of people drive to France blissfully unaware of most of the rules of the road there, that differ from the UK.
Bear in mind this became law nearly 2 years ago and GB stickers have been a requirement for decades, see this reply to a Facebook post of mine about UK stickers just recently;Sue White Posted: We crossed over between Roscoff and Plymouth a couple of weeks ago. We saw loads of British plates and the majority of them didn't have any stickers at all whilst most of the rest had GB ones. We saw possibly 10 vehicles out of 200+ with UK stickers. No one seems to be enforcing it either side of the channel from what l have seen.
The thing is you might visit France 10 times and get away with it but every now and then the French police sit at Calais or other popular ports and ticket everybody as they exit the port.
Also if you get caught speeding
then they will often look for what else they can fine you for. See our full checklist for all the items you need