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Any negotiations will take forever and probably come at political cost to any party that makes deals because the complexity and the easy, wilful misrepresentation - this is such a contentious subject now. The libertarian right probably stand to lose least in this regard for obvious reasons. They’d do relatively few standard agreements, much less taxation and regulation.
’finish’
Not really a thing. Once we’re out future governments can attempt to renegotiate all sorts at any point. Promises along those lines are going to be the new normal.
Labour have abandoned ‘No Freedom of Movement’ (officially?). EFTA and EEA (access to the single market) is possible.
Of course, but given the time scales involved it’s likely that Labour would not be in government to finish the negotiations.