If you have a Google site created under the GBBO 'umbrella' you might find this information helpful
Google Sites FAQs (relevant to customers who signed up before 12th May 2011)
You can call GBBO on 0800 500 3123 between 9 and 5.30 Monday to Friday (update: not sure if this number is still current).
One user has reported that:
"I rang GBBO via number 08005003123; they told me to go to gbbo.myportalexpress.com, click on forgotten password, put in domain name and they email you your user name and password. Log in and click the renew button."
This is the text of the email you should receive just before your domain name registration expires:
This is a quick reminder that your Get British Business Online (GBBO) domain provided by BT is due for renewal. As you know, BT provided the domain free for 2 years as part of the GBBO initiative.
To keep your domain you can renew it manually by making payment in the domain portal here https://gbbo.myportalexpress.com and selecting the renew option listed next to the domain.
If you would like to know how to do more for your business online you can contact the BT website professionals
Please be aware that if your domain name is not renewed, any email, website, or other services that were associated with it may be affected. Please renew as soon as possible to ensure there are no interruptions.Best wishes
The Getting British Business Online team