It is quite possible that you bought your domain name from another agent and then changed your domain nameservers to point your domain name to your hosting webspace with UK-Cheapest. In this case the domain name renewals will still be billed by the company that you registered your domain name with initially, and they will retain control of your domain.
If you transferred your domain name to us, then we will be able to update your domain directly, and will invoice renewals directly to you.