If you perform a WHOIS check on your .uk domain name and discover that it is listed as “Renewal in progress”, you do not need to worry.
For all .uk domain names, when a customer purchases a domain renewal, Nominet processes that renewal and sends a message to WHOIS informing them that it is in progress.
This is an automatic process, and may take a few days. During this period, you will not lose access to your domain or your website, and the renewal will occur as normal.