As an aside to that above, I have tried to add a card to my account this morning under the "Personal Details" section.
You can't click the "Add" button in there. It's a dead link.
I contacted them and, to be fair to them, they responded immediately. However, the reply was that you can add a card when making a purchase and save it for future use.
I'm not wanting to buy something just now. I want to add a card for the next time an event comes up so that I can make the purchase immediately and not miss out when trying to fill details in.
What's the point of an "add card" section on the menu when you can't add a card to your account without making a purchase first?