It used to be the case that prisoners in Britain were entitled to a minimum of one hour in the open air each day, not including time walking to and from work. However, this has changed in the last few years and now prisoners here are entitled to just half an hour, including the time taken to walk to work.
Compare this to Bagram high security prison in Afghanistan. There they are still entitled to a full hour outside every day!
I find it amazing that an Afghani prison provides their inmates with better treatment than we do, in any way. And we tell them how they should live! How has it come to this?