I got this of the website:

s it true that you get a much better pint in Ireland?
These days an Irish and GB pint of GUINNESS® Draught are pretty much the same. The water will be different, of course, because we always use pure, fresh water from local natural sources. In blind tests though (with a bunch of highly cynical journalists!), none of our sample could tell the difference. In fact, the only real difference you should be able to spot is the pub that you're drinking in.