A .UK domain name displays only 1 Contact when performing a Whois lookup.
Registrant Contact: This contact represents the owner of the domain name. Except the registrant information part, you may do whois modification in your panel.
Login to your Control Panel, search for the domain name and proceed to modify it. If you want to modify registrant name, you have to contact our customer support so we can directly submit it to Nominet (UK registry).