"The reason the British like warm beer" - never warm, but British beers (apart from British lager, which it is wisest to avoid) are brewed to be drunk at room temperature, (or a little below on a hot day or in a beer tent), rather than chilled. And that goes for Irish beer as well. (I know they sometimes try to sell you chilled Guinness these days, but it kills the flavour. And give Irish lager a wide berth.)