I’m a UK lawyer and I’ve just advised Payhip (a digital distribution platform) on how to deal with this.

The basic idea is that they will change their business model to make the relationship between you (author) and them (platform) into a B2B relationship by buying a licence to reproduce your content, then sell that licence onto customers on a B2C basis (meaning the VAT & MOSS stuff is their headache, not yours).

They’ve just put out a blog post which explains the change – http://payhip.com/blog/payhip-takes-care-of-vat/. Hopefully this is the solution many of you have been looking for!