Chancellor’s comments come as fiscal watchdog says disability benefits will cost £100bn a year before end of decade

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John Healey had said there will be a reduction in the welfare bill before the next election, with a “tough” approach to young people who do not accept support to get a job or training.

The chancellor was repeatedly pressed on the issue in broadcast interviews after documents from the Office for Budget Responsibility suggested sickness and disability benefits would cost £100bn a year before the end of the decade.