I didnt ask for the time back, the employer gave it back to me.
Like I said, the paid hours are 37.5 per week - most people do around 45-50 at least and get paid for 37.5. I guess if you work on a production line you leave on time, in a service industry with global clients employers recognise the flexibility of employees to go on conference calls at 2am and the like so when it comes to giving some back, its usually done.
Still, in a job with a clock in clock out approach I can see the issues.