Parlo, that's a fine temp guide but it's not what I experienced in Edinburgh. Or Glasgow for that matter.
Also, it is impractical for Irish pubs to keep different beers at different temps. Our market is too small to justify that expense.
I know what you are saying but it will not happen perfectly over here and from experience, nor does it in any part of the UK I have been to.
Cask ale is usually served at the correct temperature over there, unless very hot outside. Same goes here to a lesser degree.