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Single Business Identifier
Her Majesty's Revenue and Customs
12 December 2013
Data from Single Business Identifier, includes various identifiers such as the Unique Taxpayer Reference (used Self Assessment & COTAX) / PAYE reference numbers (PAYEREF) / Vat Reference Numbers (VRN). Based on HMRC's Online Registration wizard facility combined with fuzzy matching existing data sources. Updated: monthly (used to be weekly).