The generic term for this is SKD/CKD Semi knock down/Complete knock down: https://en.wikipedia.org/wiki/Knock-down_kit

I'm sure parent comment knows this, but context for others.

Manufacturing is so efficient these days that you can't really afford to have local manufacturing. There's no vehicle assembly in Australia, for instance. There's much less in Britain. There used to be vehicle assembly plants in almost every state in the US, not so many now.