Yes there's no such thing as free banking in france. The only way I can see is to get a suitcase full of money and get on the boat. Then find a uk bank to change it. Even the uk banks with branches in france charge just to move the money before exchanging it.
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I'd be more concerned with the exchange rate Euro ---> Sterling which seems to vary from bank to bank. When you obtain Euros in the UK some banks plus the post office and M&S don't make a charge at all. So paying in should not incur much of a standing charge.