What concerns me is the the EU is currently reviewing VAT and there have already been negative comments about our zero-rating. So, if Remain wins (please God, no), then I reckon we can look forward to VAT on food, medicine and childrens' clothes. And there won't be a thing we can do to stop it.

Not a scare story, but a very real possibility.
Strange .... you state its not a scare story .. but you don't state its totally untrue and made up .... but never let the truth get in the way of a good smear campaign.
http://uk.reuters.com/article/uk-britain-eu-vat-idUKKCN0V52W8
Please note the line that says ..
"Economics Commissioner Pierre Moscovici told a news conference that the executive European Commission's aim was to have a "definitive" VAT regime for the bloc, but noted that all decisions in this area were subject to national veto rights."
and
"A British government spokeswoman stressed there was no EU proposal to scrap zero rates and that London would veto it if there were. "Our position on this is clear," she said. "We will keep zero rates of VAT on certain goods and services we negotiated when we joined the European Community."

The European Court of Justice on Thursday ruled that the UK’s longstanding reduced five per cent rate of VAT on energy-saving products was in breach of EU laws. So where's our veto on that then? What happens if a member country takes us to court over zero-rating?
In any event, I think it's highly likely that QMV will be introduced for taxation, if not in 2016, then within the next few years. It is, after all, what the EC wants:
"Some Member States do not think it desirable to extend qualified majority voting to taxation. This view is not shared by the European Commission, which considers that QMV is necessary in some areas of taxation."
Yes, I think that then of zero-rating is a real possibility as the EU heads towards a superstate and harmonised taxation. This referendum is not just about what the EU is now, but what direction it is headed.
Finally, I do not like the patronising "never let the truth get in the way of a good smear campaign". I'm not smearing anyone or anything, just stating what I believe to be a very plausible scenario. Am I allowed an opinion?