I stopped in a souvenir shop in Edinburgh today, and there was an Evalon branded sign about paying in your own currency. The credit card terminal was customer facing, and, for the first time for me in the UK, a contactless transaction resulted in a DCC offer. The rate was $18.58 (at a 4% markup) for £13.99. I was able to opt out easily, but I'll have increased vigilance now with contactless transactions in the UK.