I don't think that trading with EU countries and being outside the EU will be particularly onerous nor cost-prohibitive. We seem to do quite well as it is with those presently outside the EU. And likewise, leaving the EU doesn't mean that it's an end to workers' rights or a minimum wage.
I disagree. One example is that removing the current VAT agreement will be a total ball-ache when trading goods within the EU, especially for sole-traders. Yes we do okay from trading with counties outside the EU but I believe our biggest trading partner is the EU.