Question to the Department for Work and Pensions:
To ask the Secretary of State for Work and Pensions, how many and what proportion of people in receipt of personal independence payments have a mental illness.
The Department publishes a range of Official Statistics on PIP here: https://www.gov.uk/government/collections/personal-independence-payment-statistics
These include data tables showing a breakdown of Personal Independence Payment (PIP) claims in payment by their main disabling condition.