OK, so provided you only claim back VAT on expenses incurred in the provision of services for which you charge VAT on, Her Majesty is happy.
This is now curiosity, seeing as I'm talking to a professional
Take for example a salaried offshore pilot, who in his copious time off fancies doing some onshore flying. Would they be able to be registered as a sole trader, or are the employed services/self employed services so close that they are considered indistinguishable?
I'm guessing theres no definite answer to that, depending on the mood of the inspector!