"The correct outcome of these proceedings does not in my judgment depend on an evaluation of the Secretary of State's actions in seeking to ameliorate the present position of short tariff lifers, nor in any appreciation of the cost of complying versus the cost of not complying with the PSO 4700 policy. It lies in deeper considerations. It requires, first, an understanding of the difference in nature between the two elements of an indeterminate sentence. This may be thought to be obvious enough; and superficially, it is. The tariff element fulfils the aims of punishment, which in this context are usually said to be retribution and deterrence. The post-tariff element fulfils the aim of public protection: protection from the danger which the criminal poses. This is said to be preventive rather than punitive. (Deterrence is also, of course, a preventive notion: and having nothing to do with distributive or proportionate justice, it makes an odd bedfellow for retribution. But that is thin ice where we do not have to step.) 45. However the bare distinction between punishment and protection does not reveal the reality of the difference between the two elements in the sentence which matters for present purposes. This reality lies in the way in which the prisoner's detention during the currency of each element is to be justified. I do not mean formally justified. Both elements – the whole sentence – are formally justified by the order of the sentencing court ... I mean substantially justified, or justified in reason, by reference to the aims or purposes served by each element, as I have described them."
"The point is one of principle. It has nothing to do with the wisdom or practicality of this or that use of scarce resources. It has nothing to do with the Secretary of State's recent actions to ameliorate the position relating to IPP prisoners (unless those actions now provide current and effective assessments of danger, which they do not). It does not touch the court's proper reluctance to tread ground which is the constitutional territory of the executive. It is a straightforward point of law. The Crown has obtained from Parliament legislation to allow – rather, require: the court has no discretion – the indefinite detention of prisoners beyond the date when the imperatives of retributive punishment are satisfied. But this further detention is not arbitrary. It is imposed to protect the public. As soon as it is shown to be unnecessary for that purpose, the prisoner must be released (see ss.28(5)(b) and 28(6)(b) of the 1997 Act). Accordingly there must be material at hand to show whether the prisoner's further detention is necessary or not. Without current and periodic means of assessing the prisoner's risk the regime cannot work as Parliament intended, and the only possible justification for the prisoner's further detention is altogether absent. In that case the detention is arbitrary and unreasonable on first principles, and therefore unlawful."
"The applications are allowed to the extent that it is declared that the Secretary of State for Justice has acted unlawfully by failing to provide for measures to allow prisoners serving indeterminate sentences for public protection to demonstrate to the Parole Board by the time of the expiry of their minimum terms that it is no longer necessary for the protection of the public that they continue to be detained."