Santander 123 Credit Card in America

Not sure why this isn't posted in the travel forum but answers are here:
http://www.santander.co.uk/uk/credit-cards/credit-card-faqs

^^ MasterCard exchange rate of €1 = £0.718474 as at 1 June 2015
The exchange rates reflect the rate applicable when the relevant payment scheme (MasterCard or Visa) processed the transaction and not the date on which the transaction took place.

If you are given the option of paying in either local currency or sterling, please make sure you choose local currency unless you are certain that the exchange rate is more favourable. If you choose sterling, it means that the retailer or bank will handle the conversion and may charge you a conversion fee, a foreign usage fee, or both.

When you use your credit card to buy goods or services in a currency other than sterling, we will convert the amount into sterling using the exchange rate set by Visa or MasterCard (subject to card type) on the date the transaction is charged to your account, together with any applicable foreign usage fees as set out in the table above.

The exchange rate used may differ from the rate that applied on the actual date of the transaction as exchange rates vary on a daily basis. The exchange rate used when the transaction is processed and the amount of the transaction in sterling after the application of the exchange rate will be detailed on your statement.

MasterCard exchange rates available at: https://www.mastercard.com/global/currencyconversion/index.html
Visa exchange rates available at: https://www.visaeurope.com/making-payments/exchange-rates

A daily cash withdrawal limit of £300 applies, unless otherwise advised.

1|2|3 Credit Card: You will benefit from 0% non-sterling transaction fees on purchases and cash withdrawals until 31 December 2016.