My understudying is that The Sentencing Act 2026 overhauls early release, transitioning most standard fixed-term prisoners from serving 40% to serving 33% of their custodial time in prison before release on licence. Those convicted of severe offences (e.g., manslaughter, rape) can be released at the 50% point, down from two-thirds.
But there are exceptions. Prisoners sentenced for serious violent, sexual, and domestic abuse offences can be exempt from early release.
Andy Burnham said the driver of the vehicle who received a 16-year sentence, would not be eligible for the scheme. The other two who were passengers in the vehicle and both 17 at the time, were sentenced to 13 years in custody for manslaughter but might be eligible for early release under the new Sentencing Act.
Burnham said he had spoken to the new justice secretary, who would "review the policy" and "make further statements in due course”. (BBC)
It seems to me that even without the new Act they would have been eligible for release on licence after 8 years and not 6 or 7 - but of course many not get parole at all.