We don't accept credit card payments.) Simply complete an application form and send it to us, with a cheque payable to NS&I. If you or a child you're buying for already have some Premium Bonds, you can buy via bank transfer (including standing order).
You can post a bond with a credit card if your jail or bail bondsman allows it. Paying bail with a credit card can be done online, over the phone or onsite at the jail. If you do use your credit card to post bond, however, you could potentially damage your credit score in the process.