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The DUP should take note: free travel and trade between Northern Ireland and the Republic may hinge on legal arrangements.
EPA/Stephanie LeCocq
To some it seems like the most sensible option, but it would antagonise the hard Brexiteers.
Which way forward?
safriibrahim
Nearly six months on from the UK's shock vote, there looks very little room for manoeuvre in negotiations.
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Brexiteers keen to follow Norway's example face an awkward dilemma.
European laws are often actually written in pen.
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The best option for future relations seems to be EEA membership, but that puts paid to the ideal of 'taking back control'.
What the Treasury says.
Matt Cardy
New report says households will be £4,300 worse off if we leave the EU. Here's the verdict.