I wonder is there are lists in the UK of tainted btc addresses and you sold a coin to one on the list? If so you are never going to see the money.
The UK government doesn't give a shit. No way could they be bothered to do something like this. They're too busy destroying themselves.
The sum total of everything government agencies have said about crypto is a couple of pages about tax guidance, some recent clarification from the Financial Conduct Authority about what might or might not be a security, and some moaning about stopping CFDs that's amounted to nothing so far.
That's yer lot pretty much.
The UK's banking problems are because nothing's been said, not because too much has been restricted.