The information requested is not collated or held by the Ministry of Justice.
There is an assessment process for offenders upon arrival into custody where this information may be divulged voluntarily. Numerous support services are available through local prison mechanisms.
A Mental Support Health Programme is currently in the process of rollout via the Prison Radio network, and National Referral Mechanism training will be offered to all prison and probation staff, along with an accessible e-learning package.
Data regarding the National Referral Mechanism can be found via the link below, however these statistics are the responsibility of the Home Office: https://www.gov.uk/government/collections/national-referral-mechanism-statistics