The Nissan test: can we really negotiate Brexit sector by sector?

I wrote last month that a key test of Brexit success will be whether Nissan is still making cars here in ten years’ time. A few days later, Nissan chief Carlos Ghosn issued a warning that ‘If I need to make an investment in the next few months and I can’t wait until the end of Brexit, then I have to make a deal with the UK government.’