The address used in the company registration belongs to a company that basically provides a mail box "routing service", so that you can register a "legit" company without revealing your identity. Pretty much used for offshore companies.
You've spoken to them yourself then ?
BTW just curious

Unfortunately, no I didn't

I checked their address in Google Maps, and matched with
http://www.avanta.co.uk/. BTCCat also arrived to the same conclusion (
https://bitcointalk.org/index.php?topic=744692.msg8423412#msg8423412.)