A .UK domain name displays only one Contact (there is no Administrative, Technical and Billing Contact) when performing a Whois lookup:
Registrant Contact – This contact represents the owner of the domain name
General Contacts used for other domain name extensions (TLDs) can not be used for a .UK domain name. A .UK domain name has a separate Contacts database.
For modifying the Company Name (identity) of the Registrant Contact of a .UK domain name, the current Registrant will be billed by the .UK Registry