When using your Caxton Card to pay for goods, you often get the choice of paying in either euros /dollars or in sterling. Always choose the local currency. ATMs and retailers may give you the choice, and you might think that paying in sterling saves you money. It doesn't. If you pay in sterling the retailer converts your payment at their exchange rate and you lose out. This is called Dynamic Currency Conversion (DCC) and could catch you out. Remember to check the screen before authorizing transactions. If the value is shown in pounds - ask that it is changed.