VATREC8010 | Duplicate invoices: General
From HM Revenue & Customs · VAT Traders’ Records Manual
There is no specific law relating to duplicate VAT invoices, but present policy recognises the risk that the recipient of a duplicate invoice may deduct input tax twice. The following paragraphs describe the circumstances in which:
duplicate VAT invoices may be issued; and
registered persons may adapt copies of purchase invoices for use as sales invoices