Question to the Department for Work and Pensions:

To ask the Secretary of State for Work and Pensions, how many support for mortgage interest claimants receive (a) pension credit and equivalents, (b) income-based employment and support allowance and its equivalents in universal credit, (c) income support for lone parents and (d) income-based job seeker's allowance and income support for the unemployed.

Information on caseloads for Support for Mortgage Interest (SMI) caseloads estimates is in table 3c here:

Benefit expenditure and caseload tables.