Now you see, that's the typical myopic view of a Brexiter. They think it's a good idea because everybody's going to feel the pain.

I imagine sales of German cars to Britain will drop. And that means that all the British employees working for VW, BMW, Porsche and Mercedes will suffer as well. Japanese cars manufactured in the UK may do better, though. But then those are off-shore companies as well. 

The reality is that the vast majority of the motor vehicles manufactured in the UK are owned by foreign companies. In fact, the second most produced car in the country is made by MINI, which is in turn owned by BMW. Assuming the Brits are still able to afford new vehicles after Brexit, they'll still be buying most of them from foreign companies.