Plans to change the way housing benefit is calculated could leave half of local authority areas in England with shortfalls of properties affordable to Local Housing Allowance (LHA) claimants, the National Audit Office (NAO) has warned.The NAO has probed the Government’s housing benefit reforms and warns they will result in two million households receiving lower benefits, but will save the Government £2.3bn a year by 2013/14.However, it says the department could be doing more to communica...