In order to ensure that the ownership information for .uk domains is correct and valid, Nominet run automatic checks on domains WHOIS information. If they are unable to verify the WHOIS information for your domain, it may become suspended.
If this happens, you will need to get in contact with Nominet directly to update/verify your information. For more information on this process, please visit their article on it here.
To get in contact with Nominet in the case that you need to verify your information to get your domain name unsuspended, please visit their online portal here. You can also email them via nominet@nominet.uk or call them on 00 44 1865 332244.
If you need any information on this matter, please feel free to open a ticket via your client area and a member of our team will be happy to assist.