The U.K. only has not one truly British manufacturer, they’re are all foreign owned, manufacturing cars largely for export and primarily for the EU market.
Sad, but very true.
I don't think there is any doubt frictionless trade with the EU will put the UK car industry in danger, and tariffs will most likely kill it. But even had we stayed in the EU the long term health of our car industry has always been in question, purely down to the fact that it is foreign owned. The car industry is facing the biggest global change in it's history, that of the electric car. Billions of new investment is required and we would be fools to believe that companies like Nissan BMW etc will not be concentrating that investment in their own countries. In effect we lost our car industry when we allowed overseas companies to control it.
That is why I would like to see us use Brexit as an opportunity to kick start our own industry again. Instead of lamenting the loss in jobs when these companies pull out of the UK, why can't we turn these plants into a new UK owned business dedicated to making us a centre of excellence in the manufacture of electric cars. It would need billions of state support initially, but if the workers reinvested their redundancy money into the new enterprise in exchange for shares, there's potentially billions more investment from that source. We have a skilled workforce, the infrastructure required and some of the best design engineers in the world. We could steal a march on the rest of the world in the production of electric cars and the more we sell in this country the better for our green gas targets too.
Pie in the sky?. Most probably, and I accept it's a lot more complex than my simple scenario is making out. But these are the sort of things we should be looking at rather than just accepting it's all doom and gloom. We should be making plans now so we are ready for when it happens.