Your personal details such as home address, telephone number can be hidden from .uk domains by using the Nominet WHOIS opt out. This is available to all individuals who register a domain name as long as it is not business use.
Your personal details cannot be hidden from any other extension such as .com, .net, .org.
If you have a .uk domain name and wich to activate the WHOIS opt out facility simply login to your Domain Control Panel and update the WHOIS opt-out status to Enabled.