WHOIS is a global database that keeps a record of who owns and manages domain names.
BT Business use the Registrar Register.com for domains.
Due to GDPR laws the domain registration and administration contact details you’ve got saved with BT, will not be visible via any WHOIS site.
You can contact Nominet if you wish opt out of your .co.uk, .org.uk or .uk Whois details being hidden.
Please note that it's a requirement of domain ownership that your WHOIS details are correct and you keep those up to date.
If you wish to change your domains administration WHOIS information, you can do so via the Whois tab located within the BT Domain Centre once logged into your BT account as the primary user and save changes or by clicking the contact us link on this page.
If you wish to change your domains registration WHOIS information, you can do so by clicking the contact us link on this page and then contact the team via web messenger or By email (online forms).