There are VW, Opel/Vauxhall, BMW (remember they now own Aston Martin and Mini though, so not really sure if it's classed as a German car per se) assembly plants in the UK, pumping out circa 100-230k cars a year or something.Sorry what now?
Honda, Nissan and Toyota are also in the UK, and the Nissan Qashqai has been the bestselling car/SUV in Europe for about 3 years running or something, assembled both for import and export in the UK - about 500,000 of them up to 2016.
And this is all good, but it's GERMAN/JAPANESE tech and plants - they can just as easily pull half/all the plant out and move it somewhere else, thus people will lose jobs and they'll remain partially in just so that they can produce some cars for Britain, thanks to your silly "driving on the obviously wrong side, but it's okay cuz we're unique" thing. FFS.
It's not exactly everyone bricking themselves just because they can't assemble cars in the UK - if they move it anywhere near Central and Eastern Europe the countries will boom, plus we're all close to the Eurasian connection, as well as labour here costing them about 1/3 of what it would in Britain. Same goes for any kind of assembly, be it machinery, computers, you name it. Considering we (Bulgaria), in particular, now assemble parts for Asian cars - I'd gladly welcome the fact Toyota, Honda, Nissan, VW and Opel will get cheaper.