Mark Carney should have seen this problem coming.
It's early days. Mark Carney is still finding his feet as the new governor of the Bank of England. Financial markets get things wrong with stunning regularity.
Britain will be downgraded if the budget deficit rises because of weak growth.
Big cash balances amassed by the Bank of England as a result of its electronic money-creation programme will be used to pay down the national debt by £35bn over the next 18 months, the Treasury has said.