The question is what is written on the Sterling BankCard (VPay or Maestro?) or even the Debit/Creditcards(Diners,Americanexpress,Visa,Mastercard?)
Vpay,Maestro,Visa and Mastercard are usually the standard cards that can be used almost everywhere in Europe :)
Sometimes the Cardterminal let you decide if they should do the bank action in GBP or in the local currency What is better depends on the Conditions of your Bank :)
I have for example a Visa Creditcard that i can use for free in foreign countries and it´s for me better to use local currency as then they use the Standard Bankexchange rate and not a worse rate selected by the shop ;)
Sometimes the Cardterminal let you decide if they should do the bank action in GBP or in the local currency What is better depends on the Conditions of your Bank :)
In theory, yes, but until now in these situations choosing the local currency was always the best option by far.
I have for example a Visa Creditcard that i can use for free in foreign countries and it´s for me better to use local currency as then they use the Standard Bankexchange rate and not a worse rate selected by the shop ;)
I have a very cheap credit card for EUR payments. This credit card has a 2.15% markup for other currencies (which I don't use it for). I have a Revolut card for payments in other currencies, which uses the interbank rate, with only a 1% markup during weekends.