Enable WHOIS Privacy on your domain
There is nothing to switch on. WHOIS privacy is applied automatically to domains registered with us, renewed with us, or transferred in from another registrar - you don't need to ask for it and there is nothing to configure.
.uk domains work differently. They are governed by Nominet rather than by the international rules, and their privacy option is only available to individuals - not to companies or to domains used for business. It also hides your address while still showing your name. See do I need a domain privacy service? for what is and isn't hidden on each type of domain.
For reference, there is NO additional cost for this service - it's included for free!
The only time WHOIS Privacy would be disabled would be by request. You may see the following article should you wish to disable WHOIS Privacy on your domain name with us.