[DanBC]

Early release isn't available for some violent or sexual offenders.

https://www.sentencingcouncil.org.uk/about-sentencing/senten...

> A jail sentence means more than just time in prison. If an offender is sent to prison, the judge will decide how long he should spend in custody, but time in prison is just one part of the sentence. Offenders always complete their full sentence but usually half the time is spent in prison and the rest is spent on licence. While on licence, an offender can be sent back to prison if they break its terms.

> The system of serving half a sentence in prison and half on licence was introduced by Parliament, and is not something that judges or magistrates have any control over.

https://www.sentencingcouncil.org.uk/about-sentencing/types-...

> Offenders sentenced to two years or more will serve half their sentence in prison and serve the rest of the sentence in the community on licence. While on licence an offender will be subject to supervision and the licence will include conditions. If an offender breaches their conditions, they may be recalled to prison.

The supervision will continue for longer than the sentence.