I doubt that semantically speaking, the Leaf is actually "made" in Sunderland. Strictly, it is more likely to be merely assembled in Sunderland, from parts made elsewhere. In many cases, "Made in Britain" is one of the 'weasel' phrases to get round national constraints on what may be imported. As someone who once worked in Britain's once proud commercial vehicle business, the assembly gang were considered to be a bunch of overpaid monkeys. The real skills were in the machine shops, the foundries and forges, where the parts were really "made"