Hello,
The company behind BullionCoin is registered in the Isle of Man. The Isle of Man is not part of the UK (but is part of Great Britain) which is why the Isle of Man and England & Wales have a separate company register.
The Digital Gold Ltd referred to in your thief link is registered in the UK: https://beta.companieshouse.gov.uk/company/08786335/officers
The Digital Gold Ltd behind BullionCoin is registered with the Isle of Man: https://services.gov.im/ded/services/companiesregistry/viewcompany.iom?Id=443494
Neither company is related and none of the people behind it are the same or appear to have a relationship of any form as far as I can tell.
I hope that helps.