Steve, as I explained, I refer to EU/Dublin as a block because the nature of the border will be decided by EU.
Even Rag has accepted that.

I acknowledged from the start that a hard border will be detrimental to the Irish on both sides, but Dublin gets whatever EU decides.

And we do have a clue that border sovereignty was an issue for many voters because surveys found it to be and it was a major item of the leave campaign.