Originally Posted by
tmiw
Of course, but if the terminal thinks the card's actually in GBP (since the currency code on the chip isn't set to Euro), it'll attempt DCC. Accepting DCC then results in a double conversion (merchant conversion to GBP followed by issuer conversion back to Euro).
I believe a card can only have one currency field, so if it's one of these multiple currency cards, such as Revolut, it might still be subject to DCC. If you have a EUR native card (no other currency option), you wouldn't see the DCC prompts.