This was bound to happen at some point with one or other Centralnic fake-ish domain extension, and now it has...
That's the reason why I have always leapt into the discussion on here any time somebody asked about a something.uk.com or similar SUBDOMAIN. You're 100% at the mercy of a single private party, i.e. the owner of the domain name that the subdomains are being sold from. Not a good situation to be in.
Regardless of how this resolves itself, hopefully this is the wakeup call that will finally disabuse people of the notion that a something.gb.com or a something.uk.com (or a something.*.com) is an acceptable substitute for .co.uk.