A report that the Department for Work and Pensions refused to publish found some disabled benefit claimants could not afford heating or food.
Tory ministers refused to reveal the 80-page report for more than a year - until a committee of MPs demanded it from NatCen, the research firm that carried it out.
The report found for claimants, benefits “offered a regular income which provided reassurance that some of their essential day-to-day living costs would be met”.