Kemi Badenoch has challenged Prime Minister Andy Burnham to introduce emergency legislation excluding serious violent and sexual offenders from Labour’s revised prisoner-release regime, offering Conservative votes should Parliament need to be recalled before the policy’s scheduled commencement on 2 September.

The Conservative leader’s intervention centres on provisions in the Sentencing Act 2026 that reduce the proportion of a sentence certain prisoners must serve in custody.

For most adults serving standard determinate sentences, the statutory release point would move from one-half to one-third.

Some prisoners convicted of specified violent or sexual offences, whose release point is presently two-thirds, could instead become eligible after serving half their sentence.

Release would ordinarily be on licence rather than unconditional: offenders would remain subject to supervision, restrictions and possible recall to prison.

Burnham suspended the September implementation after objections from victims, their families and criminal-justice practitioners.

The government is reviewing approximately 6,000 cases and has said that nobody will be released under the new arrangements until officials have considered the risks.

Ministers are examining safeguards that could include excluding particular categories of offender or allowing prison governors and probation officers to block an individual’s release when they judge that person to present an unacceptable danger.

Badenoch argues that an administrative review cannot supply the permanence or legal certainty of an amendment to the Act.

She has undertaken to support legislation removing serious offenders from the scheme, even if parliamentary business must be rearranged.

Her political proposition is deliberately uncomplicated: Burnham now possesses both the authority to seek a statutory change and the prospect of sufficient cross-party support to enact it.

"If Burnham repeals the early-release provisions relating to serious offenders, the Conservatives will vote for it," Badenoch said.

She is due to press the case alongside victims who contend that retrospectively shortening the custodial portion of a sentence diminishes the justice pronounced in court.

The government, however, has not committed itself to blanket exclusions and is expected to complete its review before determining how the legislation should operate.

Among the cases propelling the dispute is that of Police Constable Andrew Harper, who was killed in Berkshire in 2019 while responding to the theft of a quad bike.

Albert Bowers and Jessie Cole received 13-year sentences for manslaughter.

Under the altered rules, they could become eligible for release after serving half their terms rather than two-thirds.

Henry Long, who was sentenced to 16 years for manslaughter after driving the vehicle that dragged Harper to his death, would not qualify under the same provision.

The controversy extends well beyond that case.

An examination of official sentencing data identified hundreds of people convicted of rape, sexual offences against children and manslaughter who could qualify for an earlier release point.

Eligibility would not itself guarantee immediate freedom, nor would it extinguish the remainder of a sentence.

Nevertheless, victims argue that the distinction offers scant comfort when the custodial term they understood to have been imposed is subsequently curtailed.

Jade Belgrove, who waived her right to anonymity after reporting that she had been groomed and raped as a teenager by a family friend, has campaigned for violent and sexual offenders to be excluded.

Her petition has attracted substantial public support.

Belgrove has said that altering the practical effect of a sentence after conviction can leave survivors feeling that the ground has once again been pulled from beneath them.

Sarah Wilson, a survivor of the Rotherham child-sexual-exploitation scandal, has raised the same objection after learning that two of her abusers could benefit.

"Survivors do not get early release from the trauma," she said.

Their appeals have converted a technically intricate sentencing reform into a direct test of whether the government accords greater weight to prison capacity, rehabilitation and supervised release, or to the expectations of victims and the punitive force of custodial sentences.

The policy was devised amid an acute shortage of prison places.

The estate has been operating close to its usable limit, and official projections have warned that abandoning the release changes without providing another remedy could exhaust spare capacity by November.

Once prisons are full, the consequences reach throughout the justice system: police cells become congested, courts face difficulty remanding defendants, and the safe movement of prisoners becomes harder to sustain.

That constraint does not settle the argument, but it explains why the government cannot simply remove thousands of prospective releases without finding replacement capacity.

Ministers could construct additional accommodation, retain temporary units, narrow the exclusions or adopt individual risk assessments.

Each option carries financial, operational or public-safety consequences, and new prison places cannot be produced at the speed with which existing cells are being filled.

Labour has answered Badenoch by pointing to the Conservatives’ record in office, including the closure of 23 prisons and previous emergency releases involving thousands of inmates.

It says more than 3,000 places have since been delivered and billions of pounds are being invested in further capacity.

Conservatives maintain that those comparisons do not absolve the present government of responsibility for legislation that changes the release dates of people convicted of grave offences.

The dispute is therefore not merely over whether prisoners should ever leave custody before the nominal end of their sentences; release on licence has long been embedded in the British system.

The immediate question is which offenders may receive a substantially earlier release point, what test must be satisfied and whether ministers or Parliament should draw the boundary.

Burnham’s suspension has prevented the programme from proceeding unchanged on 2 September while the review is under way.

His government must now choose between statutory exclusions, case-by-case vetoes or a revised implementation timetable, with Parliament available to enact permanent safeguards before any of the contested releases takes place.