The panickers are panicking. We are going to leave the single market and the panickers are scared. There is no need. A fall in Sterling will more than cushion the potential blow from potential tariffs. In the global currency wars, the UK has stolen a march. The Eurozone of course will bear the main brunt of any UK-rEU trade war, as it simply cannot adapt as well as Britain can.
And that is before we start on the potential upsides of leaving the regulatory jurisdiction of the single market.