There's a lot that's wrong with the UK, but being forced to work for free thankfully isn't one of them.
I just can't imagine where people get the time for a 50-60 hour week. Once I've been to work, played with my son, fed, bathed, and put him to bed, and cooked, there isn't much time left in the day, surely?
Working part-time after a long time of full time work my eyes opened to the possibility of the 36-hour week. I usually discuss with a lot of people how they feel about their work schedule and what they think about working 6 hours in 6 days instead of 9 in 5, and surprisingly most defend the 40-hour week because they prefer two days of rest. In my experience, they're overrated. The possibility of dedicating time to yourself, your projects, your family, throughout the week is priceless.