Can I use more than one payment card?
No - you can only register one payment card to your account.
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Can I change the payment card registered to my account?
If you wish to change the card you have registered with us you must withdraw any outstanding funds back to the original card. Once the balance is zero contact us at Customer Services and after checking a few Personal Details with you we will reset your account to allow you to register a new card.
The above is from the Ladbrokes site
http://www.ladbrokespoker.com/help/account/?subsection=