Iain Duncan Smith has been accused of "living on a different planet" after hailing the controversial bedroom tax "a success" in a House of Commons debate.

During an exchange with his Labour counterpart Liam Byrne, the Work and Pensions Secretary said the policy was "shining a light on the previous government's failure" to address the rising housing benefit bill and tackle overcrowding.

Duncan Smith told fellow MPs: "It is proving a success, because what it is doing is finally shining a light on the previous government's failure to sort out the mess in social housing, with the housing benefit bill doubling in 10 years and set to rise by another £5 billion.