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