Where a customer is based outside the EU, I do not charge them VAT and have ticked in their profile "is based outside the EU".
However, I came across an issue with your invoice calculations!
I have some items I sell in bundles of 4, with a discount for higher numbers of items
This customer, purchased 10 sets of 4 for £10.84 (without VAT). However, when I entered that as the total for the line, your system insisted on entering 4p as VAT as it could not work out that each set had been priced at £1.084 (as your system only allows for 2 digits after the decimal point).
OK so you can't handle the third digit - but WHY add the extra 4p as VAT ?