We're not always able to specify why card payments don't clear, as the card payment process involves both our system and your bank's.
If a card payment fails please double check you've entered all the details correctly, that you are using a card which has not expired, and that your billing address has been entered at checkout exactly as it appears on your bank statement.
Please make sure that your billing address on your account details is the same as the details that your payment card is registered to, otherwise your payment will be declined. This is for your protection.
If all else fails then please try an alternative card for payment - we accept all major credit and debit cards.