The Bank of Bermuda used to be quite good. You could also try The Isle of Man. Make sure you don't spend more than ninety days in the UK in any one financial year though, including day of arrival and day of departure and I think it is no more than 180 days in any three year period. If you are able to set up an offshore account don't use your UK address. Might be an idea to get some independent professional financial advice the next time you are back in the UK.