Could Rishi Sunak really have saved the taxpayer £11 billion by insuring against higher interest rates last year? That was the extraordinary claim made by the National Institute of Economic and Social Research (NIESR) and in the Financial Times on Friday.

The NIESR claims that the government could have saved the money had the Chancellor taken up the institute’s own suggestion last year and forcibly converted £600 billion worth of reserves held by commercial banks at the Bank of England into two year fixed-rate bonds.