Given the difficulty UK Government is having in leaving the EU due to Parliament requiring an acceptable deal. The Prime Minister should attempt to build an agreement with the EU that keeps us in the Single Market and Customs Union.
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A Single Market & Customs Union Referendum must then be executed letting the people decide.
Brexiteers are increasing pressure on the Government to leave the EU by Oct 31st deadline - Leaving the EU while staying in the Single Market and Customs Union is a relatively simple concept and could be achieved before the deadline.
Remainers have continually argued for a good deal - Staying in the Single Market and Customs Union is likely the best method for continual trade.
The Irish border will not be affected if we stay in the Single Market and Customs Union.
The British people can then decide if we leave/stay in the Single Market and Customs Union by referendum.