Germany and France are not happy - car industries.... if a no deal Brexit happens....
If we close our borders to car imports we can't really replace them with our own cars because we manufacture bugger all. Yes, we assemble a few Nissans, Toyotas, and Vauxhalls. And our gracious foreign owners have allowed us to keep making Minis, RR, Bentleys and JLRs here in a pretence that there's still such a thing as a mass-produced British car, but all of them source their parts from outside the UK. The British car assembly model is the Japanese JIT (Just in Time) and is only made possible through the EU's single market.
Take the mini, for example. Some parts travel 2000 miles across Europe, taking in 4 different countries, before being assembled. Some Bentley parts start in Eastern Europe, then travel to the UK, then to Germany and then back to the UK for assembly. Britain produces just 40% of the car parts used in its assembly plants.
People will still buy German and French cars after Brexit, they'll just have to pay more for them. Same as the ones built in the UK.