UK GroundTruth is built and published by Dexter DCL Limited, an independent UK company. It is not a government publication, it carries no government endorsement, and nobody has commissioned it.
One address, for everything — questions, corrections, and anything about how a figure was reached.
Corrections are welcome and are the point. To make one actionable, name the page, the figure, and the published record you think it disagrees with. Every number on this site traces back to a named government source, so a correction can always be settled against one rather than argued about.
Every number published here is computed from a record a UK government body or regulator has already published, and each one carries the coverage it rests on rather than a bare total. Nothing is modelled, estimated, or filled in by hand. On the last run, 28 of 38 registered sources returned data to a request carrying no account, key or fee, and 13 of 13 systems had measured output.
The engine that does the work — the fetchers, the source registry and the database — is not published on this domain. It runs on the operator's own machine, so the figures can be reproduced without depending on anyone else hosting them. What this site serves is the interface and the result.
10 of the 38 registered sources did not return data to an unauthenticated request on the last run — some need a subscription key, some answer with a sign-in page. They are listed on the front page under What this cannot do rather than quietly dropped, because a platform that only shows what worked is not reporting coverage, it is reporting its own successes.
No page here carries an author's name or a publication date, and none is asserted in the site's structured data either. That is deliberate rather than an omission: the figures are not anybody's opinion, and the authority behind each one is the government source named beside it, not the person who wrote the page. Where a judgement has been made — what to count, what to exclude — the method is set out on the page that makes it.
The underlying records are public sector information licensed under the Open Government Licence v3.0. The research behind the platform — an access audit of UK government endpoints — is published in full at What is actually open, and the architecture at Two joins, one platform.