Originally Posted by
remyontheroad
I think the problem is that the Travelex (and other private ATMs like the ones I found on Bath Rd.) simply cancel the transaction if you choose not to allow them to do the currency conversion - at the 13.75% markup. I got caught in the airport monopoly.
That's interesting, I've never heard of that happening but it sounds very naughty. As a UK cardholder it's not something I could test because we obviously don't get the option of DCC at UK machines anyway. In any case a 13.75% markup seems obscene.
I'd suggest trying out one of the free Travelex (or other brand) machines at arrivals in LHR listed as such on that Link site above. See if you get the same result with those. If so, then yes would try one in Tesco or Post Office which shouldn't do that.