I don't know anything about this particular company. But I do happen to have some fresh information about the real-estate/property developers in Greater London area. There is plenty of freshly build/renovated residential and commercial locations that are looking for a buyer without any current tenants. Developers are again resorting to having fake occupancy by letting trustable people to live and use the facilities free of rent&utilities. Conditions typically are: be personally known to trusted people in the construction business, be able to move out on a very short notice (few days at most), be trusted and capable of leaving the property in the "as new" condition, don't look and behave like a chav.

The holy grail of the Bitcoin mining is free electricity. Paradoxically, it is easiest to get it in the areas that normally have very high rents and costs of utilities. You won't get it on the regular commercial/residential terms, only as a temporary fallback financed by the developers/bond holders/speculators. Certainly, you won't find them advertised anywhere.

From my broader experience I'm pretty sure that such conditions aren't limited to London, UK. So keep your eyes open for opportunities like that in the city near you.

Again, the above was a general information, not specific to any particular offer discussed above.