David Cameron has told Clacton MP Douglas Carswell to get “a sense of a humour”.
The Prime Minister made the suggestion to his fellow Conservative during PMQs today.
Mr Carswell asked Mr Cameron about his view of Government bureaucracy compared with the satirised version made famous by the 1980s television sitcom Yes Minister.
He said: "A few weeks ago in this House I asked you to what extent you believed the Whitehall machine - the Sir Humphrey factor - was frustrating reform; you assured us it wasn't.
"According to the Financial Times in Malaysia last week, you said, 'As Prime Minister I can tell you Yes Minister istrue-to-life'.
"Can you tell us what's happened to change your mind?"
A chuckling Mr Cameron replied: "There are a few occasions where I think you need a bit of asense of humour."