I suspect his reasons for not bothering with the EU market is the draconian rules being imposed by the Commission which restrict the power of many appliances, under 'save energy, save the planet' auspices. He's had a running battle with the EU over energy labelling for more than 4 years and although he finally won the latest round at the ECJ I think he's likely fed up with the lot of them, like so many of us.
https://news.sky.com/story/dyson-win...rules-11547949
https://www.bbc.co.uk/news/business-41119355