Pat - you aren't getting it - what are you a Doctor of if you don't mind me asking?
This is hypothetical following the logic of the 2nd ref lobby.
and you make exactly my point.
You cannot ask the electorate to decide on the detail of the arrangement as the detail they select is not necessarily going to be negotiable.
NB. Recall the Commons have only voted for 1 solution up to now. That is the Brady amendment. Apparently it isn't feasible, the EU won't agree.
So you cannot have a 2nd ref, or a ref with any detail. You have to say Leave or Remain and then carry out the result with the executive sorting out the detail.
The problem here is that the detail they have sorted out so far away from what the Leave voters voted for that it is beyond credibility in terms of delivery of the result.
It is not what was set out in the manifestos of Labour or Tory at the last GE, not what Mrs May has set out in her various set piece speeches.
Brexit isn't like Scots devolution, where you can set up the framework and then a few years on revisit and tweak domestically by juggling the competencies. This is an international treaty that has to be right, or we get stiffed.
However, I have to pull you up as well on your "it was never on offer" and quoting the UK PM.
When we had the campaign up to voting in 2016 we had all the great and the good of UK politics telling us that:
1. This was it - one vote - in or out.
2. It would mean leaving the EU in full and specifically the Single Market, Customs Union (even if rarely mentioned by name it was clear we would be controlling our own trade policy) and jurisdiction of the ECJ.
3. Article 50 would be invoked immediately by the then PM Mr Cameron and Mr Corbyn called for it on Friday morning.
and following the result even the staunchest Remainers such as Vince Cable, Yvette Cooper, Tim Farron, Anna Soubry.... confirmed the above. Whilst the LibDems changed tack, the others didn't as evidenced by the manifestos that both Labour and Tory stood on in the 2017 General Election and the numerous videos, articles and social media posts out there.
The red herring of a hard border you refer to was only raised in Autumn 2017, 18 months after the referendum result.