I hear from some people that when selling a large amount of Bitcoin and having that money hit their UK bank account, the bank has froze their money or notified them they will close their account.
Other people say they had no issues and no one has said anything.
Have you have any problems and more importantly who gave you the best rates and was the least hassle to deal with.
I never seen any such cases before,why they have to freeze your account if you not doing anything illegal?sometimes this will happen if you are not paying any taxes for your income to the country.
So you need to file and audit all your income and need to pay taxes as per your country rules.