Been trying to buy a ticket MAD-LHR on 7 Dec on BA0467. On BA.com Spanish page, Visa Debit cards are not an option. Visa credit does not work. Trying to buy the same flights on IB.com produces an error. (Fare on IB.com is €7 cheaper for the same flight, but knowing the IT problems between the companies, I would prefer to transact on the operating carrier's website.) Tried the earlier flight too, same problems. Any ideas?