“NO, no, no, no, no,” Sir James Dyson tells me.

I’m squashed into the back of a classic Mini as it whizzes me and the legendary British inventor around the streets of Berlin. I’d just asked him a very simple question.

Dyson, the billionaire, has been showing off his new Dyson, the vacuum cleaner . It’s called the PencilVac and it’s 38mm thin.

That’s about half the width of an iPhone screen . It basically looks like a broom.

So sensibly, I ask whether this is it. Surely we have reached the practical limits of how svelte a vac can get?

“No, no, no, no, no,” he replied.

“No, I mean, the little motor, it was unthinkable five years ago. No one was doing it.”

Dyson launched his first vac in 1983, after developing thousands of prototypes.

I ask him how the 78-year-old how his younge

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