Border checks have caused tension in Northern Ireland but were there warnings in the Brexit campaign?
That didn't happen because divorce negotiations between the UK and the EU agreed early on that avoiding a hard land border should be an absolute priority.
The prospect of this happening was briefly discussed during a visit to Londonderry on 9 June by two former prime ministers - Sir John Major and Tony Blair. Both were strong supporters of Remain.Mr Blair argued a vote to leave would mean the only alternative to controls on the land border "would have to be checks between Northern Ireland and the rest of the UK, which would be plainly unacceptable as well".
In response, the Northern Ireland First Minister Arlene Foster spoke of "deeply offensive" scare stories from the Remain campaign, and the then Northern Ireland Secretary, Theresa Villiers, also a prominent leave supporter, said any suggestion that Brexit could have a negative impact on the peace process was "deeply irresponsible".
The Leave campaign said customs wouldn't be a problem, because "the EU already allows its members customs-free access to non-EU countries." That is only true for countries that are in the EU customs union. For Britain, it is incorrect."The leave people say it will just stay," Mr Blair said. "But when you go into the detail you realise how difficult if not impossible that is.
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