@JCampbell, in the future, rather than posting a screen shot of many-year-old posts, please quote them using the quote feature of the forum’s composing pane. It took me quite a while to track down the old post you were referring to.
If you read that entire thread, you will see that the other forum member described a personal workflow and apparent preference. But, when asked for official documentation requiring an Outside the Scope tax code, nothing was provided. The developer’s position has been that whenever something is required by regulation, it should be built into the program. Are you able to furnish such documentation? If so, the separate tax code should be added to Manager’s localization for the UK.
To be clear, I am not a qualified UK accountant. But my reading of HMRC regulations reveals no such requirement, only guidance about which transactions fall outside the scope of VAT.