If you hit up the international section of your local supermarket, you may see both English and Irish breakfast tea, but what's the difference?

They put loads of, like -- I'm older than this ... If you ask for just a tea in a British café, you're getting English breakfast tea. Joe: That's not bad. But you always gotta do it with milk?

But then that begs the question of what makes English breakfast tea different from other varieties, like Irish breakfast tea?