This is a question that comes up regularly, but doesn’t get completed
The poster on the recent thread below says they will update us as it progresses
Legally you can import RIFs into the UK for the purpose of Airsoft skirmishing at insured sites.
By law you do not require UKARA membership - that is the best known scheme to document proof that a player is a skirmisher
If you are already a player overseas and intend to play at insured sites here then you are legal - but might not be able to prove it
Look at the other thread, think of ways that you can prove you are a skirmished, contact Border Force etc, and let us know how you get on
If you’re not confident that you can prove it to Border Force then look for other options such as making arrangements with an Airsoft site, shop, an established player (that knows you) or wait until you are here and have played to attain UKARA then have them sent to you