The level of offending is down to the consequences of overcrowding in our prison – namely the inevitable failure of rehabilitation efforts in this context. Failing to roll out successful initiatives is another reason that you can argue that this government is especially culpable.

You make an interesting point re drug use. Random testing of prisoners should occur as it does in other nations. Where drug use is shown to be more than negligible, governors should pay with their jobs. That would help focus minds.