Track Companies House records and get alerted when the official United Kingdom register publishes a change.
Legal name change; Registration status change (active, struck off, dissolved); Registered address change; Legal form change; Director appointment or resignation; New filing (accounts, confirmation statement).
Watched records are re-queried against the official source on a recurring schedule, and an alert is raised only when a published field actually differs from the last snapshot.
Source: Companies House official search