Written House of Commons answer yesterday. Only guaranteed until the end of the spending review period to 2019-20:-
Housing Benefit [115226]
Hywel Williams:
To ask the Secretary of State for Work and Pensions, whether he has plans to discontinue discretionary housing payments.
Caroline Dinenage:
Discretionary housing payment funding is allocated to Local Authorities to help housing benefits recipients with both housing costs needs and the impact of housing welfare reforms.
Details of the Government's plan to continue Discretionary Housing Payment funding for Great Britain to the end of the Spending Review Period were stated in the Summer Budget 2015.