This website appears to have a company number registered at Companies House in the UK.
https://www.gov.uk/government/organisations/companies-house
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Get access to data on 446,573 websites that are Companies House Customers. We know of 446,556 live websites using Companies House and an additional 17 sites that used Companies House historically and 13,333 websites in the United States.
Get a list of 446,573 websites using Companies House which includes location information, hosting data, contact details, 446,556 currently live websites and an additional 556,947 domains that redirect to sites in this list. 17 sites that used this technology previouslyand 13,333 websites in the United States currently using Companies House.
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These are sites that we think might use Companies House in the future because of their similarity to other sites that already do.