Concerning drones under 250gms....Drones under 250g. Previously, if you flew drones under 250g then you didn’t need to register as an operator. Under the new rules from 31 December 2020 if your drone is under 250g and has a camera then you will need to register as an operator and renew this annually. The only exception to this is for drones which are toys. The law doesn’t require you to also obtain a flyer ID but we strongly recommend that you do. It is free and gives you an overview of the rules to keep your flying safe and legal.
You can register and gain a flyer ID at Register-drones.caa.co.uk

Same as in the EU!