I had a US colleague stay with me in Ireland for a week and he was asking if it was possible to catch a train to England. It’s amazing the geographic ignorance of some people and Americans seem to be especially afflicted. Maybe it’s because the USA is so big and large cities so far apart it doesn’t occur to them that Europe is not the same.

You live in a world with the chunnel. The odds that a similar passage between islands formerly of the same empire is not so remote.

The odds are and were actually zero since no such tunnel exists. And if people are aware of the chunnel spanning 20 miles they sure as hell would be aware of a tunnel between Ireland and England which would be a nigh impossible feat of engineering whether it went directly, or circuitously through Wales or Scotland.