The former boss of Vauxhall in Luton said the factory’s "troubles began with Brexit"
https://www.bbc.co.uk/news/articles/cvg72x5kxy5o
https://www.bbc.co.uk/news/articles/cvg72x5kxy5o
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That said, I'm absolutely certain that Brexit was the final nail in the coffin.
The decline started a while ago but Brexit just put the nail in the coffin.