There are many simple ways to achieve this.
1. Do not bring it in all at once, or bring it in during different UK tax years.
2. Have more than one account at the same bank and choose to bring the money from the account that has the best tax result (2,3,4 or greater numbers of accounts are a common standard tax planning technique, depending on circumstances)
3. Close the accounts currently in place and open new accounts with the same bank.
4. Close the accounts currently in place and open new accounts a new bank offshore.
I have been advising on remittances for around 20 years, all of these work but you'd really need a discussion because the golden rule for me -and you I am sure too - is to do the simplest thing providing it is not going to cost too much money.
(I am assuming that there is no living trust or other trust in place, because for larger amounts setting up a US trust can also eliminate the UK issues).