Sadly, he wasn't planning to sell them in Europe, and in order to manufacture them at a cost they could a hope of selling at a viable price meant manufacturing close to the far eastern markets they were targeting. Alas, with the slowing growth of those economies even that is no longer deemed viable, so he's binned it off."The future's electric, that's why Dyson's investing squillions of pounds in Britain, roooool Brittanyuuuuur , Brittanyuuuuur waives the rules, Spitfires over Kent, rat a tat tat take that Johnny Forriner... Oh...
Nearly all of the 400+ of the development jobs were UK based, and loom likely to remain as the new found battery technology is applied to their core products. So yeah, he's done his bit for UK jobs and for our econony, and he still lives here and pays UK taxes, so I won't be too churlish.
I agree though that your granny blowing on your hands would dry them quicker than a Dyson Airblade.
As for Nissan, every time there is some kind of economic upheaval they make noises about leaving the UK as a tactic for generating bribes, sorry, grants, from the government to get them to stay. It has nothing to do with their economic viability and everything to do with being a tactic to get the local government to give them money. They've done the same trick at their manufacturing facilities in Hungary and Poland too. Of course, it has recently backfired for Honda, who took their bribe and then shortly afterwards announced they're closing down their UK operation - they're now having to repay that government investment.
Nissan aren't daft and they know that if they wind down any UK operation they too will now have to repay the hundreds of millions they've received over recent years, so the fact they're making their usual and regular silly noises in their attempts to attract further bribes to stay shows that they have no intention of leaving - why bother accepting a grant you'll only be made to pay back with interest? These companies can't not pay them back, as if they fail to do so then once that precedent is set no country in the world would ever subsidise their local operations again, and they would be out of business.