Theresa May has said the UK "cannot possibly" remain within the European single market, as staying in it would mean "not leaving the EU at all".
Which is not quite true as such countries, for example, as Switzerland, Norway, Iceland and Liechtenstein (not EU members) have tariff free access to the EU single market via free trade agreements.
Moreover, that 's exactly what Leave campaign promised: Quote them: Europe yes, EU no. We have a new UK-EU Treaty based on free trade and friendly cooperation. There is a European free trade zone from Iceland to the Russian border and we will be part of it. We will take back the power to negotiate our own trade deals.
How come that we are talking about walking away from that and falling back to WTO?
What will we do if we will need EU immigrants to fill NHS vacancies, for example (and NHS stats show that 5% of NHS staff are from EU)? Or other vacancies which cannot be filled internally? It will be a big irony if we end up inviting EU workers and not having free access to single market.