Before the tests I was allowed to go on a tour of a male and female prison.
Over here, they female prisoners don't wear uniforms; they are permitted to have their own clothes. They can leave their rooms as they please, have a library, each got their own carpeted room with a walled off toilet, and most had a TV in their room. Some even had Playstations. It looked almost more like rehab than a prison.
And then I toured a male prison and the environment was completely different. Two men per concrete cell with an open toilet in the corner, they were supervised at all time, and had to wear their prisoner uniforms.
Take my advice; if you ever have to go to prison in the UK, say you identify as a girl!