Oh, I gotta jump in here!
Right, what you need to know is that there are essentially 2 kinds of beer. What you drink in the US is what we call lager beer. Basically, its a brew that has had the fermentation halted by being sterilised, which means it will keep more or less indefinitely as long as it remains unopened. It's a pleasant enough drink best served ice-cold.
In our pubs we usually drink barrel beer, often just called ale or best bitter. A normal barrel holds around 20 - 40 gallons of beer, and the beer is still in a mild state of ferment, which means that it's life is limited to about a week.
The beer is pulled up from the pubs cellar either electrically or by hand pump and served directly to the customer, usually in pints. As it is used, so the space created in the barrel contains a greater proportion of air which speeds up the fermentation of the beer. If the beer is chilled excessively, the fermentation is destroyed, and as it is this fermentation that keeps other bugs at bay - remember that as an opened barrel it is not now sterile - the beer quickly spoils.
So there you have it, real ale is a living thing, excessive chilling will kill it, so we have it served at it's best, which is luke warm.
And this lively Englishman certainly ain't luke warm!
Englishman.
..... fanaticism masquerading beneath a cloak of reasoned logic.