Originally Posted by
Tobias-UK
Presumably PayPal would transact in GBP with your debit card? It sounds like your debit card is one of those that does not permit foreign currency transactions. If so this is outside the control of BA (well to the degree they only permit transactions in the currency of the country of the originating flight).
I have the same issue. My debit card definitely allows foreign currency transactions.
It won't actually allow you to select anything other than a credit card when you go to pay. I don't know why BA have this policy. I have the same problem when booking one ways from Europe to the UK.