Comment: Gibraltar riddle leaves Mrs May between a Rock and a hard place
Here's one from the cold comfort department: that border between the North and the Republic is not the only Brexit UK-EU frontier flashpoint.
We in Ireland rarely think about Gibraltar - that odd British rock jutting into the Mediterranean and attached to the south of Spain.
Back almost 30 years ago, in March 1988, three IRA activists did think a lot about the place as they planned to blow a large chunk of it sky high. But they were summarily shot dead in very controversial circumstances by British commandos of the SAS.
In an earlier time, from 1835 onwards, the Irish Christian Brothers ran a large school on the Rock and their biggest school lasted until 1977. The Irish Ursuline sisters also operated schools there for decades. For the rest, Irish links are rather diffuse.
Those with a literary bent may know that James Joyce's fictional Molly Bloom grew up on the Rock and speaks rhapsodically about it all in his epic novel Ulysses. The authorities in Gibraltar reciprocated with a statue of the young Molly Bloom in the beautiful Alameda Gardens.
By now we hear you ask: is there a political point to these facts and oddities about Gibraltar of all places? Well there is a rather strong point.
And it is that we are in the middle of a very European crisis and we must see it as such. If Ireland is to make alliances to get what we want in the Brexit talks, we need to know all about all the other member states' needs.
The British have held tiny Gibraltar since 1704. The so-called "British presence" in the island of Ireland was cemented by the 1609 Plantation of Ulster. No one predicted Gibraltar would become an early flashpoint in the Brexit negotiations, but that was the outcome of the publication of the EU negotiating guidelines late last month.