Mr Breivik is in police custody, in solitary confinement without access to news or the internet for the next eight weeks.

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Even there, however, the transparency has been limited, as with, for example, American access to terror suspects in Saudi custody.

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The revised project still aimed to provide prison and probation staff with improved access to the information they needed "to effectively manage offenders in custody and in the community", he said.

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On Tuesday, Mr Grayling also announced a review of the youth custody estate in order to ensure that young people who are detained get better access to education, as well as plans for mentors to help steer prisoners away from a life of crime.

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