Oh, I can understand. I was surprised first going there, as a teenager, too.
Sorry, not sure what part of what I said was dismissing your statement in that way. I only discovered the immigration thing post-joining SSP. I think perhaps I should've said, "I'm not surprised, anymore".
I've no idea what caused their accent to be so close to ours. It definitely wasn't an accent that could've come from Scotland. And even their flag in that video, despite the Scottish symbolism, is still Irish green.