I spent a few months at a prison where you could lock your own cell from inside or outside but staff could override it. I also had a phone in my cell. Unfortunately, I engaged with the system and behaved too well so they sent me to Cat D and all that disappeared.

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If you are to punish a man retributively you must injure him. If you are to reform him you must improve him. And men are not improved by injuries. (George Bernard Shaw)

Its not all bad news then, it seems that prisoners may be given a higher level of respect in prison with a stronger emphasis on rehabilitation after reading this Sky new story today. Lets hope this becomes the norm.
https://www.msn.com/en-gb/news/uknews/prisoners-can-unlock-their-own-cells-at-uk-jail/ar-BBVnzEc