I am writing a book. I have a man and a woman, they have legitimately sold a company and have millions of pounds in a bank. Someone is after them. They need new identities (passports) and to get the money overseas in their new names. How do they do it? They are based in the UK. Does the old scam of seeking a dead infant, getting birth certificate, passport still work? They money bit I do not know how to deal with now we have tight money laundering rules.
If it's their money, they can do what they like with it, including handing it over from their old identities to their new ones. They can probably find better ways of investing it than sticking it in the NatWest; but currently the banks of choice seem to be in New Zealand, where interest rates are high, which means you get a better return than here.