How does “Companies House and HMRC checks” work on the Company Structure page?

Check registers verifies every company number and VAT number now; the weekly sync does the same on its own. A number that fails its own check-digit test shows red before any lookup. A profile field Companies House holds differently, a new officer, a resignation, a name spelt differently or a director listed twice can be applied with one click; a PSC that does not match the shareholders is shown and dismissed, never applied, because the share register is yours to decide. Every accepted difference is written to History like any other change. Where: Company Structure (/accounts/company-structure).