Hi Nicholas
No, I never said it did, but I suspect you are forgetting about product liability, whereby manufacturers are strictly liable (i.e. automatically negligent) for their faulty products. That's another story, though.
I'm the marketing director of a large manufacturing company, so product liability is never far from my thoughts ;-)
But your points are well made and I am happy to accept your informed view.
Of course, if Tesco breaks the product, causing it to be faulty
(Only joking.)