I am sure you'd get a warm welcome at any shoot.
Csfta have a Grand Prix on 29th of June at Newbury which is just a few miles west of London. This would be probably the closest national shoot to Dover or the euro tunnel. Or there is SEFTA Grand Prix on 18th may at ETL. Both clubs are on the airgun club map so you can see their location.
BFTA/NSRA County Coach
CSFTA Chairman/BFTA Rep