My employer wants to cut out some admin. The HMRC website has a section on Modified Vat Invoices for amounts over £250, and lists the information that must be shown on a modified invoice.
Having looked at the details that are present on till receipts issued by one of our establishments I believe that the information this contains meets all of HMRC criteria. I contacted HMRC to get their opinion which was slightly ambiguous, but did seem to conclude that the proposal was ok.
Before I advise my employer to go ahead I would welcome any information from someone who may have gone down this same route, along with any pitfalls to avoid that may have arisen.