Why are my personal details showing on my domain name Whois?
If you plan to use your domain name for your business or any type of trade (this includes the registration of domain names for monetisation purposes, e.g. pay per click advertising etc) or professional transactions, you will not be entitled to opt out of having your address displayed. This information must displayed on the domain name "Whois" records for any business.
This is outlined below by Nominet:
If you have any questions please contact your Account Manager who will be happy to help!