Britain has apparently just accepted that Northern Ireland will continue to have full regulatory alignment to the Republic of Ireland.
https://www.theguardian.com/politics/blog/live/2017/dec/04/theresa-may-heads-to-brussels-hoping-to-conclude-phase-one-of-brexit-talks-politics-liveIt's highly improbable that this can happen without the UK continuing to have full regulatory alignment with the EU.
That means continuation of the Single Market and European court rulings.
The ludicrous hard Brexiteers, people like Nigel Lawson, Jacob Rees-Mogg and Ian Duncan-Smith, are about to have apoplexy.
This was inevitable though, because there is no way we can leave the Single Market without a hard NI/Ireland border and the latter is impractical and unacceptable to all concerned.
It's all down to Ireland again! In British Isles affairs, it always is.