Ministers delay prison-capacity detail as MPs consider sentencing changes

Ministers are asking MPs to accept major sentencing and prison-capacity decisions before publishing the full capacity statement meant to explain the assumptions behind them.

In a written answer published on 4 September 2026, Justice Minister Catherine McKinnell did not provide the month-by-month prison-population modelling requested by Conservative MP Nick Timothy. Instead, she said the Government had legislated for an annual statement on prison capacity, which “will be published later this year”.¹

Timothy had asked whether the Ministry of Justice had modelled the adult prison population from August 2026 to February 2028 under three scenarios: the Sentencing Act 2026 implemented as enacted; the Act implemented with offence exclusions announced on 4 August; and the early-release provisions in section 23 excluded entirely.¹

The answer matters because it followed a 1 September written ministerial statement in which Justice Secretary Alex Norris confirmed that the Government would exclude rape, serious child sexual offences, unlawful killings including manslaughter, causing or allowing the death of a child, death by dangerous driving and indecent assault from eligibility for changes to release dates under the Sentencing Act.² He also announced a £110m acceleration of prison-building work to create “additional headroom” in the custodial estate.²

What Parliament has been told

The Government has set out the broad political and operational case for its approach. Norris said the adult male estate was again operating at more than 98% capacity, after men’s prisons had been at 99% capacity in July 2024 and, at one point, had fewer than 100 places available across the male estate.²

He said ministers had committed to delivering 14,000 prison places by 2031, of which 3,200 had already been delivered, and that the Government had returned around 11,700 foreign national offenders to their countries of origin.²

The statement said the Sentencing Act was designed to put the prison system on a more sustainable footing while avoiding further emergency release schemes. But after public and parliamentary concerns, ministers paused implementation of the progression model and reviewed which offences should be excluded.²

According to the Justice Secretary’s statement, the result is that “hundreds more dangerous criminals” will stay in prison for longer.² What has not been published is the modelling showing how many extra prison places those exclusions are expected to require, over what period, and how that demand compares with capacity expected from new cells, foreign national offender removals, IPP reforms and other measures.

What remains unpublished

The 4 September answer confirms that ministers are not, at this stage, giving MPs the scenario-by-scenario figures Timothy requested. McKinnell said the progression model had been reviewed with prison capacity in mind, alongside concerns raised by victims, survivors, parliamentarians and the public.¹

But the answer did not disclose the projected adult prison population under the three scenarios named in the question. Nor did it provide monthly capacity assumptions between August 2026 and February 2028.¹

That leaves a gap between the policy decisions already announced and the evidence Parliament has been able to scrutinise. MPs know that ministers believe the prison estate is under acute pressure, that a wider group of serious offences will remain outside the early-release reforms, and that £110m is being brought forward for estate work.

They do not yet have the published capacity statement that would show the balance ministers are striking between sentence length, population pressure and available prison places.

Capacity pressure and recalls

The political pressure is sharpened by concerns about recalls and the durability of previous release measures. A UK Fact Check assessment of BBC reporting said official figures showed 51,419 licence recalls in the year ending March 2026, up from 40,259 the previous year — a 28% increase.³

The same fact-check said more than 70,000 people had been released under the 2024 SDS40 early-release scheme by March 2026. It also said caution was needed in framing recalls as primarily reoffending, because many recalls relate to licence breaches or risk escalation rather than a new charge.³

That distinction is important for Parliament’s scrutiny. If recalled prisoners are absorbing much of the headroom created by early release, the capacity benefit of new release mechanisms may be smaller or less predictable than headline release numbers imply.

Without the requested modelling, MPs cannot see how the Ministry of Justice has accounted for recall flows in its forecasts.

Building work and timing

Norris said the Government would fast-track work including new cells in existing prisons, accelerated prison-build programmes and investment in new land for prisons, funded through the £110m package.²

The key capacity question is timing. The offence exclusions will keep additional prisoners in custody for longer, while estate works can take months or years to deliver usable places. The statement says ministers are acting to create headroom, but it does not publish a timetable showing when each tranche of additional capacity will become available or how much pressure will remain before then.²

Ministers have also pointed to foreign national offender removals and future use of Sentencing Act powers to remove eligible foreign national offenders serving determinate sentences immediately after sentencing.² They have said the most dangerous offenders will continue to serve sentences under current arrangements and that those removed under the scheme will be barred from returning to the UK for life.²

IPP legislation adds another variable

The 1 September statement also committed the Government to bringing forward legislation to end remaining Indeterminate Imprisonment for Public Protection sentences by the end of this Parliament.²

Norris said 99% of IPP prisoners who had never been released were beyond their tariff, and 80% had served 10 years or more beyond it.² He said public safety would remain the top priority and that the work would proceed on a cross-party basis.²

The capacity effect of that policy is not yet clear from the statement. Depending on eligibility, risk assessment and release sequencing, IPP reform could relieve some pressure on the estate. But ministers have not published figures showing how many places they expect it to free, or when.

The scrutiny question

The Government’s argument is that it inherited a system close to collapse and must act quickly to protect victims, maintain public confidence and keep enough places available for courts and police.¹²

The scrutiny issue is narrower: whether Parliament should be expected to endorse or absorb the consequences of sentencing and estate decisions before seeing the annual prison-capacity statement that ministers say will provide transparency.

For now, MPs have the direction of policy, selected headline capacity figures and a promise of a fuller statement later in 2026. They do not yet have the underlying scenario modelling that would show how ministers believe the prison system can absorb stricter offence exclusions, continuing recall pressure and delayed estate expansion at the same time.