“Also, there are hundreds of un-monitored crossing points on the island of Ireland.”
As there are in Sweden/Norway, Mikey. More probably because it is 1,000 miles long compared to about 300 for the Ireland:UK divider.
There is actually no problem at all (as far as the UK is concerned) with the Irish border. Post Brexit the UK can do what it likes with traffic from the south to the north. It can allow completely free reign (as has been the situation for about 100 years). What the Irish do about traffic in the opposite direction is, of course, a matter for them. Oh no! I forgot! They cannot do as they like because they are in the EU. So it is for the EU to decide what conditions prevail. If they had any sense (which is why it probably won’t happen) they could simply retain a borderless facility. Ireland is not part of their beloved Schengen Area so there are still border controls between Ireland and the rest of what remains of the EU. Personally I think the Euromainiacs should get their heads together to come up with a solution. After all, it’s their border just as much as it is ours. Trying to solve a practical problem which has an effect on real people might divert their attentions away from making extortionate financial demands of the UK. But I doubt it.