Ed Miliband is claiming that it would take until 2058 to meet the coalition's targets for home building at the current rate.
The Prime Minister appears to disagree about the precise numbers of houses built.
Shadow financial secretary to the Treasury Chris Leslie writes for ITV News in response to the Chancellor's Spending Review.
While the Conservatives and Lib Dem strategies are clear enough, Labour's response to government cuts is not yet obvious.
By excluding pensions and the benefits associated with the economic cycle, Osborne has put an automatic cap on a narrow range of benefits.