Sign into Xbox.com with your details, select Gold membership, if your silver you will have the option to have a months XBL for £1.
Once the payment has been taken goto xbox.com and look at your membership level. It will say Automatic renewal : On
If so go to account summary and then in the grey section you will see membership level again. In green it should give you the option to turn on/off automatic renewal.
Taken from HDUK.
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