EnglishEdward
Deity
The EU has an excellent negotiating position so who knows what they are going to push for. Myself, I don't understand the local logistics enough to really comment, but it's going to be interesting to follow over the next couple years. From what I've heard putting up border checks in Ireland/N. Ireland would be problematic in some parts (a lot of parts?) because the border runs through roads, houses, neighbourhoods, etc.
Northern Ireland is not the sort of place that large numbers of illegal migrants will find
it easy to hide in. The identity checking will likely be when they apply for benefits,
housing or work in the North or travel to ferries or planes to mainland Britain.
The populations south and north of the border may well benefit from being able to buy
at the lower of the EU or UK price. No doubt the police services may take action at
large scale scams organised by large gangs who have violent turf wars, but they will
likely be sensible enough to turn a blind eye to individuals out shopping.