CUTTING WELFARE is rarely comfortable for the Labour Party. But the scramble to trim the health-benefits bill ahead of the Spring Statement last month was particularly messy. After weeks of rows Liz Kendall, the welfare secretary, promised Parliament that her cobbled-together reforms would save £5bn a year. Unfortunately the Office for Budget Responsibility (OBR), Britain’s fiscal watchdog, reckoned she had over-egged the savings by a billion-plus. Cue a hasty rejig and even deeper cuts.