Re: Jon Snow.
Also even during Dev's so called Economic War against the EU, there was always a Common Travel Area. That may end for first time ever. There will be the cost of a border fence. Even before 1973 and during troubles there has never been a physical border.
UK wants the NI-UK to Ireland border to be the Irish ports and airports, like 13th Century to 1922! Neither EU nor Ireland will agree to that.
In the long term Ireland may benefit if International and other EU suppliers ship direct to Ireland rather than is so often the case via a UK middle man. Books, Magazines, Music, DVDs, Games etc very much treat Ireland as a UK region. DVDs etc often have an extra added Irish classification sticker, though some are printed, but alongside the UK one!
Very many "Irish" papers are thinly disguised UK ones.
BBC & ITV are the next popular TV stations and available to near 100% FTA and over 82% get them in a PayTV package. PayTV historically high as UK TV wasn't always FTA on Satellite, though Dublin, East, South East and Border got Terrestrial TV from UK since 1950s, Irish TV only started hours before 1962.
This is biggest change since Irish break with Sterling in 1979 (In reality Ireland only had its own currency 1979 to 1999)
Ireland has suffered because UK left ERM and didn't join Euro. Brexit will not be as simple as Ni Unionists or Brexiteers claim. EU totally decides what it is, with any one of the 27 having a veto!
The Referendum had lies on both sides.
It's FAR worse for Gibraltar who face the border with Spain being closed and withdrawal of 14,000 Spanish workers and loss of Spanish trade. It's only because UK and Spain are both in EU that the Spanish - Gib border is cordial!