EFTA is a free-trade organisation of Iceland, Norway, Switzerland, and Liechtenstein. Three of those are members of the EEA, Switzerland has bilateral agreements with the EU, such that all participate in the ESM. Is it possible to join EFTA without joining EEA or making agreements with the EU? Although EFTA is in principle an independent organisation from the EU, EFTA members have access to the ESM so I would expect that the EU might have a say in EFTA membership. How does joining EFTA work in practice?
For example, suppose the United Kingdom leaves the EU without any deal, and then, perhaps after a change of government, decides that the disruption to trade is causing unacceptable economic and societal damage, and decides to urgently join EFTA. What would it take to do so and would it, by itself, restore free trade between the UK and the ESM?