Stress Free Car Rental said: “British driver’s UK insurance is still valid for visiting the EEA during the transition period. “But after this period, Brits will need a green card. This is a document from your insurer to prove your car is covered if you are driving in Europe.” GB car sticker Experts have recommended drivers have a GB sticker on their vehicle even if there is a GB logo on their number plate. However, current guidelines say driver's do not need a sticker if they already have a GB or EU flag on their number plate so this could continue if a deal is struck.