They (EU) are too busy harmonising whether a UK national driving a Spanish registered car speeding in France should be fined/castrated/electrocuted . . . . . . . that they have no time left to deal with whether you should have to give a credit card when arriving in hospital in Spain ( even if you pay tax in UK & have a European Health Card ) so, don't expect any decision anytime soon on anything that doesn't include filching your money.
B@STARDS !