Additional data
Additional information on the safe, decent and secure running of the prison service.
Visit prisons and probation statistics for data sources and more details.
Annual prison performance ratings
Prison level performance is monitored and measured using the Prison Performance Tool (PPT). In 2021/22 this provided a data-informed assessment of performance in each prison to derive overall prison performance ratings. As part of the end of year moderation process, each prison's data-informed provisional rating was scrutinised by HMPPS officials against wider evidence, including data on how COVID-19 had impacted each site, to agree final ratings.
In the PPT, overall performance is rated as either performance is acceptable or performance is of concern.
Values:
- 4 - Outstanding performance: 13 prisons
- 3 - Good performance: 62 prisons
- 2 - Performance of concern: 35 prisons
- 1 - Performance of serious concern: 9 prisons
For the source of this information and more details please refer to the publication: Prison performance ratings (annual)
Published: 27 July 2023. Next publication: 25 July 2024 9:30am.
1 - Performance of serious concern
Crowding
Percentage of prisoners held in crowded accommodation.
| Period | Crowding |
|---|---|
| Apr 1998 to Mar 2099 | 20.0% |
| Apr 1999 to Mar 2000 | 20.1% |
| Apr 2000 to Mar 2001 | 18.2% |
| Apr 2001 to Mar 2002 | 19.2% |
| Apr 2002 to Mar 2003 | 23.3% |
| Apr 2003 to Mar 2004 | 24.8% |
| Apr 2004 to Mar 2005 | 24.3% |
| Apr 2005 to Mar 2006 | 24.0% |
| Apr 2006 to Mar 2007 | 24.6% |
| Apr 2007 to Mar 2008 | 25.3% |
| Apr 2008 to Mar 2009 | 25.3% |
| Apr 2009 to Mar 2010 | 24.6% |
| Apr 2010 to Mar 2011 | 24.2% |
| Apr 2011 to Mar 2012 | 25.1% |
| Apr 2012 to Mar 2013 | 23.9% |
| Apr 2013 to Mar 2014 | 24.1% |
| Apr 2014 to Mar 2015 | 25.5% |
| Apr 2015 to Mar 2016 | 24.5% |
| Apr 2016 to Mar 2017 | 24.5% |
| Apr 2017 to Mar 2018 | 24.2% |
| Apr 2018 to Mar 2019 | 22.5% |
| Apr 2019 to Mar 2020 | 22.5% |
| Apr 2020 to Mar 2021 | 20.2% |
| Apr 2021 to Mar 2022 | 20.6% |
| Apr 2022 to Mar 2023 | 22.9% |
Apr 2022 to Mar 2023
22.9%
Data source
The data source for this measure and more detailed information can be found in the HM Prison and Probation Service annual digest publication.
Publication date
Published: 15 February 2024.
Releases in error
A prisoner is released in error if they are wrongly discharged from a prison or court when they should have remained in custody, where the prisoner has not deliberately played a part in the error (i.e. the prisoner had no intent of escaping).
Examples include misplaced warrants for imprisonment or remand, recall notices not acted upon, sentence miscalculation or discharging the wrong person on escort.
| Period | Releases in error |
|---|---|
| Apr 2006 to Mar 2007 | 52 |
| Apr 2007 to Mar 2008 | 31 |
| Apr 2008 to Mar 2009 | 63 |
| Apr 2009 to Mar 2010 | 68 |
| Apr 2010 to Mar 2011 | 63 |
| Apr 2011 to Mar 2012 | 42 |
| Apr 2012 to Mar 2013 | 44 |
| Apr 2013 to Mar 2014 | 50 |
| Apr 2014 to Mar 2015 | 49 |
| Apr 2015 to Mar 2016 | 64 |
| Apr 2016 to Mar 2017 | 72 |
| Apr 2017 to Mar 2018 | 66 |
| Apr 2018 to Mar 2019 | 64 |
| Apr 2019 to Mar 2020 | 50 |
| Apr 2020 to Mar 2021 | 46 |
| Apr 2021 to Mar 2022 | 54 |
| Apr 2022 to Mar 2023 | 71 |
Apr 2022 to Mar 2023
71
Data source
The data source for this measure and more detailed information can be found in the HM Prison and Probation Service annual digest publication.
Publication date
Published: 15 February 2024.
Prison staff in post (bands 3-5)
The chart shows Band 3-5 prison officer staff (full time equivalent) at the end of each financial year.
| Period | Prison staff in post (bands 3-5) |
|---|---|
| March 2010 | 24,830 |
| March 2011 | 24,369 |
| March 2012 | 22,735 |
| March 2013 | 21,506 |
| March 2014 | 18,251 |
| March 2015 | 18,222 |
| March 2016 | 18,327 |
| March 2017 | 18,403 |
| March 2018 | 21,038 |
| March 2019 | 22,630 |
| March 2020 | 21,928 |
| March 2021 | 21,926 |
| March 2022 | 22,001 |
| March 2023 | 22,288 |
March 2023
22,288
Update 31-Dec-2023
At 31 Dec 2023 there were 23,266 Band 3-5 FTE officers in post.
Data source
The data source for this measure and more detailed information can be found in the HM Prison & Probation Service workforce quarterly publication.
Publication date
Published: 17 August 2023. Next publication: 16 May 2024 9:30am.
Staff sickness (prisons)
Sickness absence (average working days lost per FTE staff) for operational grade staff.
| Period | Staff sickness (prisons) |
|---|---|
| Apr 2009 to Mar 2010 | 11.6 days |
| Apr 2010 to Mar 2011 | 10.5 days |
| Apr 2011 to Mar 2012 | 10.7 days |
| Apr 2012 to Mar 2013 | 11.2 days |
| Apr 2013 to Mar 2014 | 11.9 days |
| Apr 2014 to Mar 2015 | 12.1 days |
| Apr 2015 to Mar 2016 | 11.1 days |
| Apr 2016 to Mar 2017 | 10.8 days |
| Apr 2017 to Mar 2018 | 9.7 days |
| Apr 2018 to Mar 2019 | 9.9 days |
| Apr 2019 to Mar 2020 | 11.1 days |
| Apr 2020 to Mar 2021 | 13.4 days |
| Apr 2021 to Mar 2022 | 15.8 days |
| Apr 2022 to Mar 2023 | 14.1 days |
Apr 2022 to Mar 2023
14.1 days
Update 31-Dec-2023
For the 12 months to 31 Dec 2023 there were an average of 12 working days lost to sickness for operational grade staff.
Data source
The data source for this measure and more detailed information can be found in the HM Prison & Probation Service workforce quarterly publication.
Publication date
Published: 17 August 2023. Next publication: 16 May 2024 9:30am.