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The information you ask for is available in the public domain in so far as it relates to those serving the IPP sentence in prison; however, I have provided it for ease of reference. As at 31 March 2019, 2,403 prisoners were serving IPP sentences and who have never been released, and a further 1,063 prisoners were in custody having been recalled from the community.
Data on prisoners serving IPP sentences are published quarterly as part of the Offender Management Statistics bulletin: https://www.gov.uk/government/statistics/offender-management-statistics-quarterly-october-to-december-2018
It is for the independent Parole Board to review the detention of those prisoners serving an IPP sentence who have completed their tariff period. The Board will direct the release of these prisoners only if it is satisfied that the levels of risk posed to the general public are reduced enough that the National Probation Service and its partner agencies can safely manage them in the community under supervision.