It emerged today that the head of communications at the Department for Work and Pensions has accused Today presenter Evan Davis of bias during an interview with Secretary of State Iain Duncan Smith.

The Daily Mirror has used a Freedom of Information request to secure a copy of a letter of complaint sent to the BBC by Richard Caseby following the interview in March.

In it he reportedly said: "I was dismayed by the BBC Radio 4 Today interview conducted by Evan Davis in which he failed to allow Mr Duncan Smith to finish his answers, asked loaded rhetorical questions – ‘why are you punishing people?’ – and gave a histrionic aside to listeners: ‘This is so frustrating!’.”