There is an overcrowding crisis in UK prisons. There are also problems with gang violence, drug abuse, self harm and a record number of weapons now being made in jails. To deal with the chronic overcrowding, the UK government has begun releasing thousands of prisoners early in England and Wales.

Katya Adler is joined by senior UK correspondent Sima Kotecha to talk about her time inside one of Britain's most notorious jails as they examine how the prison system in England and Wales has been stretched to breaking point.

Producers: Alice Aylett Roberts and Eleanor Sly

Sound engineers: Matt Dean and Mike Regaard

Assistant editor: Sergi Forcada Freixas

Senior news editor: Sara Wadeson