You should check your "facts" before posting. Dyson moved manufacturing to Malaysia and Singapore. There are 4,000 Dyson employees in Malaysia, not UK as you claim. He also moved Dyson's headquarters to Singapore.
He would keep his designers in the UK because if he didn't get a govt subsidy. Despite Dyson's weepy-eyed Jingo publicity, there are perfectly good designers elsehwere in the world.
Dyson is largely a Far Eastern company with a British born boss. The difference between Chinese manufacturers of ventilators and Dyson is that Dyson has no experience.
Price gouging is Dyson's forte. That's how he became a billionaire. I don't see why he should use the epidemic to bilk even more money out the British government.