IIRC, the poorer parts of the UK are where the car factories are, and they used to export a lot — might still do, but the investment in that sector is down due to Brexit, and that's because the cheap imports included parts for manufacturing cars.
As for labor, again IIRC, the (fruit?) farms are labor intensive and locals aren't interested, at least not at the wages that the farms can afford given what they get paid by the supermarkets, who can't meaningfully pay more without raising prices, which they can't do without hurting more people: even before I left, I was seeing "donate food to the food bank" baskets at the doors to supermarkets in well-off areas like Cambridge.