They are a currency exchange & it was suggested for me to get refund by changing my € (I was shopping in Italy) to £ to USD, if I wanted USD. Just ask for it back on ur credit card!
Very good service, they have a person to help u check ur forms before getting them stamped. However, don't be fooled by them suggesting to take cash rather than getting money back on your credit card.
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Travelex
Terminal 3, Departures (LHR Airport) Hillingdon Greater London TW6 1QG United Kingdom