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This is a process imposed by the merchant or ATM provider and not by Caxton FX.
The merchant or ATM should ask you if you wanted to pay in the local currency. When processing a transaction in sterling on your card, the retailer or ATM converts the transaction in your home currency with the intention of providing the exchange rate and, generally, you will lose out.
In order to avoid this happening, please check the payment or ATM screen or ask the merchant for the currency in which the transaction is being processed. If the value you are shown is in sterling, please ask that it be changed to the local currency to avoid DCC. You can find more information here