From The VATman Cometh, Destroying Businesses by Cheryl Morgan:
Except that the new rules coming in next year have a turnover threshold of zero for digital products. Yes, that’s right. If all you do is sell one ebook, or a few knitting patterns on Etsy, or a little app you made for fun, you are required to register for VAT and file VAT returns once a quarter. Even if the tax involved is only pennies.