Those car companies appear to be acting as agents for the EU, trying to pressure the UK into a deal.
a deal which gives the car companies free access isn’t going to happen. It’s too late - there are only 3 months left and tons of matters to get through. Plus BoJo has the covid crisis to work through.
The UK will put barriers in the Irish sea to keep the Good Friday Agreement safe but the rest won’t happen.
What’s the impact? Well, job losses and car jams are the sure ones. The UK as a whole (well specifically England and Wales) voted to leave and they should get a clean no-deal. That would end all speculation about what might have been