I've just, rather late on, started listening to episode 4, Paddy's Green Shamrock Shore (which seems to be about migration in general, not only from Ireland).

One speaker refers twice to people leaving Ireland in the 19th century to migrate to "the UK". Worse: that speaker sounds Irish himself. How can he not know that Ireland was part of the UK at that time? It's understandable that people from outside these islands get confused about England/Britain/the UK, but there's no excuse for a native to do so, and most especially not for an Irishman.