From the FT:
Mastercard to increase fees for UK purchases from EU
Departure from single market spells end for Brussels-mandated cap on transaction levies
From October 15, Mastercard will charge 1.5 per cent of the transaction value for every online credit card payment from the UK to the EU, up from 0.3 per cent at the moment. For debit card payments, the fee will jump from 0.2 per cent to 1.15 per cent.