Humans are remarkably resilient to duress under the appropriate circumstances. British people in particular.
Elaborate.
Whilst not specific to English people, I'd say that if a country tried to invade mine and I was flying to defend mum, dad, sister, girlfriend and my mates, a bit of cold showering and lack of breakfast wouldn't stop me giving any douche who thinks he or she can invade my country what for four or so times a day.
Especially when you'd be going home to see mum, dad, sister and girlfriend after having faced hell with your mates. Helps to give one that 'extra push' when it seems to be going down the drain as well, I'd suppose.