The Brits are by no means alone
Nordic passengers can hit the bottle just as hard on their holiday flights and despite their reputation for being very lovely people they do share a disruptive rate comparable to the UK.
We do need to keep this in perspective mind you, the rates for Nordic and British passengers might be slightly higher than other countries but overall they're not massive. It's not like a serious incident occurs every day.
I fully agree with easyFlyer, long haul flights and premium / business cabins see just as many incidents as a rate, so I pay little heed to any snobbery from those that insist that cheaper tickets have somehow brought this on. Alcohol simply makes some people aggressive, be they well paid professionals or low paid casual workers.