Data on offender learning participation, and learner characteristics, is published by the Department for Education.
Data on learning difficulties and/or disabilities amongst those prisoners who engage in prison education is at: OLASS: participation and achievement by equality and diversity & English and maths level: 2010/2011 to 2017/18. Self-declared data on learning difficulties and/or disabilities gathered as part of the assessment of prisoners’ levels of maths and English on reception is at: OLASS English and maths assessments by ethnicity and learners with learning difficulties or disabilities: participation 2014/2015 to 2017/2018. The data consistently show that around one third of prisoners have a learning difficulty and/or disability.
In April 2016, the Department for Education published a breakdown of the type of learning difficulty and type of learning disability amongst prisoner learners for academic years 2011/12 to 2014/15. That data is at: Offender Learning breakdown by disability and learning difficulty 2011/12 to 2014/15.