If your subscription is in its final 30 days, there will be a link on the home page that says 'renew subscription'. Use this link to make payment of £16 for another year.
Once an Update Service subscription has expired it cannot be reinstated.
To re-subscribe, you will need to apply for a new Standard or Enhanced DBS check and use the new application to subscribe.
You can subscribe to the Update Service on the Subscribe to the Update Service page.