VRS3375 | Fundamentals of the retail schemes: Mixtures of schemes: Combining the point of sale scheme with normal accounting
From HM Revenue & Customs · VAT Retail schemes guidance
Some businesses, operating from one outlet only, may need to use the normal method of accounting for VAT for supplies made to other VAT-registered businesses and the point of sale scheme for other supplies. This should not cause any problems even though supplies may be made from a common stock. But the business must keep separate records of sales made for each method of accounting they use.