Entities Are Not Strings: Designing UK Business Onboarding That Knows What It Is Looking At
UK B2B sign-up forms often treat a legal entity as two text fields: a company name and a VAT number. That works until a sole trader, a charity or an overseas-owned UK company arrives. This article sets out a practical data model and validation strategy using Companies House, VAT and PAYE signals, with clear rules for when to block, when to review and when to let a legitimate edge case through.