I am from Britain and I can say with experience that working for a company in exchange for money is not an effective way to avoid 24⁄7 sleep with the hero situations. I know quite a few people who have a poor work life balance because they are working for a company and have more stressful situations and conflicts. I’ve seen people work themselves to depression, divorce, and death thanks to my involvement with the very toxic British banking culture.
Your avoidance of such things dependends on the independent variable of how assertive you are at managing your work/life balance and how good your goal setting is. It’s quite easy to overwork yourself for money. Wanting to be a sidekick or a hero or a equal professional doesn’t increase or decrease your skill at maintaining a work life balance or your goal setting skills any more than it increases your physical strength or intellect.
Banking has that reputation in America too. I would hazard a guess that the problem is banking, not Britain (I used to work in finance, though not in banking specifically).