Neither Johnson nor any other Tory candidate think that Britain can develop as a walled-off economy. They want trade deals. Above all the top Tories want a trade deal with the USA, on Trump’s terms, with all the neoliberal provisos about investor rights and opening public services to profit-piracy. And with none of the dimensions of opening borders and limited social levelling-up which exist in the EU. They see that reorientation as a way to “complete the Thatcherite revolution” in Britain. To win that, they are willing to pay the price of a new “hard border’ in Ireland.