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.


Prison level performance is monitored and measured using the Prison Performance Tool (PPT). The PPT uses a data-driven assessment of performance in each prison to derive overall prison performance ratings. As in previous years, data-driven ratings were ratified and subject to in depth scrutiny at the moderation process which took place in June 2020.

In the PPT, overall performance in each prison is rated on a 1 to 4 scale. The ratings are 4: Performance is exceptional; 3: Performance is acceptable; 2: Performance is of concern and 1: Performance is of serious concern. More information is available here.

Data source: Prison performance ratings

2019-20

Annual prison performance ratings Count
1: Of serious concern 7
2: Of concern 28
3: Acceptable 65
4: Exceptional 19

Percentage of prisoners held in crowded accommodation.

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Period Crowding
Apr 1998 to Mar 1999 20.0 %
Apr 1999 to Mar 1900 20.1 %
Apr 2000 to Mar 2001 18.2 %
Apr 2001 to Mar 2002 19.3 %
Apr 2002 to Mar 2003 23.3 %
Apr 2003 to Mar 2004 24.9 %
Apr 2004 to Mar 2005 24.4 %
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 2020 to Mar 2021 20.2 %

Data source HM Prison and Probation Service annual digest


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.

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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 2020 to Mar 2021 46

Data source HM Prison and Probation Service annual digest


Staff in post (prisons)

The chart shows Band 3-5 prison officer staff (full time equivalent) for public sector prisons at the end of each financial year.

For further context and commentary, please see the HMPPS Workforce Statistics Bulletin

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Period Staff in post (prisons)
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 22,002

March 2022 22,002

31-Mar-2022

At 31 Mar 2022 there were 22,002 Band 3-5 FTE officers in post.

Data source HM Prison and Probation Service workforce quarterly


Staff sickness (prisons)

Sickness absence (average working days lost per FTE staff) for operational grade staff in public sector prisons.

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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 2021 to Mar 2022 15.8 days

31-Mar-2022

For the 12 months to 31 Mar 2022 there were an average of 15.8 working days lost to sickness for operational grade staff in public sector prisons.

Data source HM Prison and Probation Service workforce quarterly


Rate of Band 3 - 5 prison officer staff resignations per public sector prison establishment.

Data source: Prison performance ratings

2019-20

Staff resignation rate Count
Did not achieve target 34
Achieved target 71

The percentage of foreign national prisoners that were referred to the Home Office within 10 days of each relevant sentencing.

Data source: Prison performance ratings

2019-20

Foreign national prisoner referrals Count
Did not achieve target 26
Achieved target 44

A measure of prison spend against agreed annual budget.

Data source: Prison performance ratings

2019-20

Public prisons operating within budget Count
Over budget 37
Within budget 67

The percentage of staff adequately trained to deal with incidents in prisons.

Young People prisons undertake minimising and managing physical restraint (MMPR) training. All other prisons undertake control and restraint (C&R) training.

Data source: Prison performance ratings

2019-20

Control & restraint staff training (C&R) Count
Did not achieve target 25
Achieved target 94

The average number of staff adequately trained to deal with more serious incidents in prisons.

Data source: Prison performance ratings

2019-20

Tornado commitment Count
Did not achieve target 19
Achieved target 73

To help drive improvements in living conditions in prisons. Residential units, cells, communal areas including serveries, toilets and showers are observed.

The living conditions audit is carried out approximately annually. The data presented here shows the most recent assessment for each prison establishment.

The summary percentage is based on audits published internally by HMPPS. The annual prison performance ratings publication includes audits which had not been published when it was released and were therefore suppressed from the data tables. Including these suppressed scores, the overall percentage of prisons scoring a 3 or 4 is 80.7%

Data source: Prison performance ratings

2019-20

Audit of living conditions Count
Rating 1 1
Rating 2 9
Rating 3 30
Rating 4 10

A government internal audit which reviews financial and performance data processes.

Data source: Prison performance ratings

2019-20

Data integrity (governance and operational audit) Count
Rating 1 1
Rating 2 14
Rating 3 21
Rating 4 48

Whether any difference in survey results from white and BME prisoners is statistically significantly different (i.e. did not occur by chance).

The MQPL survey is undertaken as a part of a rolling three-year programme. The data presented here shows the most recent assessment for each prison establishment.

Data source: Prison performance ratings

2019-20

Measuring the quality of prison life - BME simplified Count
Significant difference 43
No significant difference 48