How does prison release and probation actually work?
Most prison sentences are served partly in custody and partly in the community, under licence — which is why someone sentenced to a number of years is released before that period ends, and why that release is not the end of the sentence.
The crucial point about sentence length. A determinate sentence is not a period of imprisonment; it is a total sentence, divided between custody and supervised release. Release at the automatic point is a change in how the sentence is served, not early termination — which is the single most common misunderstanding in public debate about sentencing.
The routes out:
Automatic release, at a proportion of the sentence for most determinate sentences, with the remainder served on licence in the community.
Parole Board release for indeterminate and certain longer or more serious sentences, where release requires a risk assessment and the Board must be satisfied that detention is no longer necessary for public protection. The Board cannot release someone because they have served long enough — the test is risk, not punishment.
Home detention curfew, allowing earlier release on an electronically monitored curfew for some prisoners.
Release on temporary licence, for work, training or family ties before release.
What licence means. Supervision by probation, with conditions — where to live, reporting, exclusion zones, non-contact requirements, curfews, tagging, and work or programme requirements.
Breach means recall. A licence can be revoked and the person returned to custody, either for further offending or simply for breaching conditions. Recall for non-offending breaches is a substantial proportion of the prison population, which is a significant driver of prison numbers.
What probation actually does: risk assessment and management, supervision, enforcement, delivering community sentences, preparing pre-sentence reports for courts, and supporting rehabilitation — housing, employment and substance misuse, which are the strongest predictors of whether someone reoffends.
Resettlement is where it succeeds or fails. Release without accommodation, income or identification documents is strongly associated with reoffending, and the first weeks are the critical period.
General information, not legal advice.