When you redeem an Amazon.co.uk gift card or gift certificate to your account, the funds will be stored in Your Account and automatically apply to your next eligible order. The original expiry date, if any, applies to any unused funds.
Note: If your order total is more than your gift certificate balance, the extra will be paid for by your default payment card.
If you want to save your gift certificate balance for another occasion, you can choose to check out without using it when you select your payment method. Simply uncheck the box next to Use your £X.XX Gift and promotional balance. If you don't see this screen during checkout, you can click Change under the Payment Method heading on the final page before you place your order.