How many prisoners who have completed their tariff remain in prison for the purpose of public protection.

On 17 November 2010, 14,680 prisoners were serving an indeterminate sentence of imprisonment for public protection, or a life sentence in prisons or secure hospitals. Of those, 6,320 are held beyond their tariff expiry date, excluding offenders who have been recalled to custody following release.

Those prisoners have been held in prison for good reasons and on good judgment. Does the Secretary of State intend, as is rumoured throughout prisons, to reduce the number of such offenders in prison? If so, how many sex offenders and violent criminals will be released back into our communities?

That rumour is probably on the hon. Gentleman's website where I have seen that he is telling his constituents that I will release robbers, burglars, drug dealers and so on. Perhaps he will wait for the sentencing review, and stop living in a fantasy world. The indeterminate prison sentence has never worked as intended. The intention was that it would apply to a few hundred dangerous people who were not serving life sentences. The number is piling up, and more than 6,000 have gone beyond their tariff, but they will not simply be released. We will re-address the subject, and we will not release all the people he keeps telling his constituents we will release.

Will the Secretary of State look at the Prison Reform Trust's report and specifically conduct a review of the social and financial costs and benefits of IPP sentences, and examine the available policy options set out by the trust?

We are taking a balanced look at the whole subject. The Prison Reform Trust takes quite the opposite view to that of John Mann. It believes that those sentences should be scrapped entirely. It is critical of the way they work, and it is clear that they are not working as intended, but the Government are hoping to take a balanced view. We must obviously protect the public against dangerous people and the risk of serious offences being committed on release. On the other hand, about 10% of the entire prison population will be serving IPP sentences by 2015 at the present rate of progress, and we cannot keep piling up an ever-mounting number of people who are likely never to be released.

Does the Secretary of State accept that it is inherent in both life sentences and the concept of IPP sentences, which are widely supported throughout the Chamber, that many prisoners will be tariff-expired because the idea is that they are not released until it is judged that it is safe to do so? Does he also accept that although it is true that the precise construction of the clauses was inappropriate and led to some very short tariffs, since the changes that I introduced in 2008, the number of new IPP sentenced prisoners has dropped by 50% from about 1,500 to under 1,000 a year? Would it not be far better for public safety to let that work through instead of prematurely releasing such prisoners?

No, it has always been the case that some people are held indeterminately, and certainly those on life sentences. The purpose of IPP sentences was to have a sentence below a life sentence for dangerous people for whom life was not quite justified. The right hon. Gentleman will accept that such sentences never worked as intended, which is why, when he was Secretary of State, he introduced an Act of Parliament to try to correct some of the mistakes that had been made. We are now considering how the sentence works in practice, and we will introduce considered proposals in due course.