For .uk domains currently, you cannot mask whois details at all!
For companies and organizations though, yeah, they have to be public, but I think that's fair enough.
Owner Addr : Obfuscated whois Gandi-63-65 boulevard Massena
Owner Addr : Obfuscated whois Gandi-Paris
Owner Addr : WA
Owner Addr : FR
and my full name. Seems obfuscated enough, especially since the name was not remotely validated.