Yeah I get it, but still. Britain got its priviliges in the EU by being a part of it for a long time. If it becomes a problem in some 20 years, Britain probably won’t be alone, will have been a member for a longish time and will most definitely be better off than outside the EU. And if it comes to it, they’ll be able to leave again.
At least they’ll have the most experience in leaving which might make the second time at least a bit more painless.
They aren’t meant for public roads, just like Teslas.