Articles
Real workflows on real public data. Every piece here uses named UK companies and real figures from the Companies House register, states when the data was gathered, and ends by telling you how to check it yourself.
- Data study · In production since 26 February 2026
Most UK company accounts do not contain a turnover figure
We measured 26,112 company lookups. Fewer than half produce machine-readable accounts, and of those, only about one in fifteen carries a turnover figure at all.
Published 24 September 2026
- Engineering · In production since 13 February 2026
What 600 requests per 5 minutes really costs a batch job
The Companies House rate limit is enforced per IP as well as per account, slides rather than resetting, and one officer lookup is never one request.
Published 24 September 2026
- Data study · In production since 8 May 2026
The ECCTA deadline is not 18 November, and 45% are already past theirs
Verification deadlines are set per company, not nationally. We measured 627 directors and PSCs: 45% were already past their date, and some fall in December.
Published 24 September 2026
- Comparison · In production since 11 February 2026
Companies House, OpenCorporates, OpenRegistry or us: which to use
An honest comparison of four ways to get UK company data, including the three situations where Registrum is the wrong choice and you should use something else.
Published 24 September 2026
- Changelog · In production since 11 February 2026
What we shipped, month by month, since February 2026
A dated record of every capability Registrum has added since the first commit in February 2026, including the things we got wrong and had to correct.
Published 24 September 2026
- Ownership walk · In production since 13 March 2026
Who owns Nando's? Following the chain to a named person
Nando's UK sits under three holding companies before the register names a human being. Here is the whole chain, and the point where control stops meaning ownership.
Published 24 September 2026