YH wrote:It seems that indeed such services are 0% rated (or exempt?),
Ha ha. As a technicality, it's neither (although 0% would be most accurate to describe). The supply is outside the scope of UK VAT (as the supply is deemed to take place in your customers country), its basically the same as it being zero-rated as any VAT that you incurred in relation to performing this work can be treated as input tax (i.e. you can recover it) subject to normal conditions and you have no restrictions on recovering VAT.
I'm a bit of a stickler for terminology, and where you're not wrong in saying zero-rate, I'd steer clear of using the term exempt as it throws up all sorts of confusion.