All this stuff is super confusing. https://www.austrade.gov.au/contact/faqs/i-want-to-export-my... says you need to register if:
> your VAT taxable turnover is more than £85,000 (the 'threshold') in a 12 month period
> you expect to go over the threshold in a single 30 day period
WTF? How the hell would anyone know that? What if you never sell to the UK, but someone goes on a run because some product randomly becomes popular. It is such an unnecessary minefield.