The Best Way to Handle Money in the UK as a VisitorATMs in the UK do not charge you a fee, so you will be hit by your bank's charge and the exchange rate provided, but this is often cheaper than bringing physical money and exchanging it.
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It's not always better to exchange before you flyIn many countries, you're likely to get more for your home currency once you arrive – just make sure you avoid airports and unreliable vendors and choose somewhere trustworthy, such as a bank.
Best: Use a debit card at an ATMThere are lots of options for converting your money to a foreign currency, but the easiest and most economical one is probably already in your wallet.
The usual credit card exchange rate used for purchases made abroad is 2-4%. Credit card networks (i.e. Visa, Mastercard, American Express, and Discover) generally use conversion rates based on interbank rates they select from customary industry sources on the business day prior to the processing date.