Not sure how that can work.
Camelot is not British, for a start. Running the National Lottery was never UK owned. It was given away abroad right at the start, to the "Camelot" company, owned by a Canadian teachers' union.
That is no longer the operator.
Since 2024 the Lottery has been run by Allwyn Entertainment Ltd, a branch of the Allwyn Group. That is described as "multinational" by Wikipedia, and by itself as a "global" lottery operator. Both adjectives usually means American so if that is the case here, good luck trying to make them pay all due taxes in other countries.
I could not find the Group's real nationality, and its own web-site does not state it; but Allwyn Entertainments Ltd. is registered to an address in Watford, Herts.
It has always been supervised by the Gambling Commission, to ensure fair gaming. As far as possible. It operates legally but raising the draw from 6-in-49 to 6-in-50 immediately decreased the chance of winning the jackpot by 50 times.