I'm interested in your question because I have for the first time a client in the USA. Sorry I cannot help because I'm a bit in the dark, too. But may I ask you what you understand the correct VAT treatment to be for supply to customers in the USA, and, perhaps even more useful, where did you find out about that?
(I searched and searched the HMRC site, but kept getting only to customs duties and procedures for goods clearance and labelling etc. I couldn't find anything that told me whether to charge VAT on supplies to USA.)
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