Decline in car manufacturing already.
"Since the decline of British-owned car companies in the 1980s, the UK automotive industry has been rebuilt by overseas manufacturers investing in operations based on frictionless integration of products and people with other European countries, and no tariffs or regulatory barriers. SMMT’s most recent figures state that 814,000 people are employed in the UK industry, which in 2015 turned over £72bn and exported £34bn worth of products, with 56% of car exports and 65% of components going to EU countries. Recently the SMMT announced that investment in the first six months of this year had reduced to just £322m, from a total of £1.66bn invested last year and £2.5bn in 2015."
SMMT.