The Treasury’s official watchdog, the Office for Budget Responsibility, is likely to slice around £11 billion off its March borrowing forecasts of £37.1 billion in its latest assessment. But the Chancellor is unlikely to sanction a full-scale giveaway amid nerves over the impact of Brexit on the economy. And despite a loosening of the purse-strings for the NHS, the Institute for Fiscal Studies warned this week that unprotected departments could still face a £15 billion budget crunch.