[5] It houses offenders who are from Humberside, North, South and West Yorkshire and parts of Lancashire and Greater Manchester.

An additional self-contained unit for vulnerable boys in custody has officially opened in 2009 by the Youth Justice Board, the Keppel Unit holds up to 48 boys aged 15–17, offering enhanced support including individual care plans, extended enrichment opportunities exclusive to Keppel Unit; such as the weekly 'Park Run', where the trainees are offered the chance to stroll or compete for lap times around the pond and surrounding recreational pitches, and small animals where the trainees can handle and assist in the caring of rabbits & the various breeds of duck.

[3] The enhanced supervision unit (ESU), Napier, was opened in 2019 able to provide additional care and support for 6 young males.

[11] Courses are provided in a variety of subjects and individual timetables are developed to meet the trainees' needs in conjunction with the sentence planning process.

It aims to allow the cadets to decouple from the social circles that caused them to offend and offers basic life and organisational skills as found in the British Army.