GB flags on number plates still legal post Brexit

The GB flag on your number plate will still be legal after Brexit, regardless of the outcome, though drivers will need to display a GB sticker on the rear of their vehicle when travelling abroad.

It will still be legal to display GB number plates after Brexit, with or without a deal.

See https://www.bnma.org/news/gb-flags-on-number-plates-still-legal-post-brexit/