At one point during a television interview the Prime Minister lost his cool and tried to leave the set with a microphone still attached to his lapel.

Interviewed by Sky TV’s Adam Boulton, Mr Brown snapped: “You are sounding like a political propagandist yourself.”

He then complained: “Look, Adam, we are going through a recession. I don’t think you asked about that at all.”

The PM said his personality was not the issue and when Mr Boulton persisted, he interjected: “It does obsess you.”

Mr Brown, who complained of battling a hostile media during the conference Scots Night on Sunday, said: “I try to get my message across, it doesn’t help when the newspapers try to translate it into something different to what it is.”

At the end of the interview, Mr Brown looked furious when the cameras turned off and he tried to walk away.

However, he still had a microphone clipped on and did not realise he was supposed to remain in the same seat for his next interview with the BBC’s Sian Williams.

Mr Brown stood up while Ms Williams was still speaking to the cameras and in his haste to exit stepped between her and the camera.

Earlier, the PM courted more controversy by saying he had made up his mind on whether to take part in a live television debate with David Cameron and Nick Clegg, but would not say what his decision was.

The PM’s media contretemps came as senior Labour figures sought to brush aside The Sun’s decision to drop its support for Labour and back David Cameron’s Conservatives.

Lord Mandelson branded the paper’s executives a “bunch of chumps”, saying he did not think its readers wanted “a Tory fanzine”.

Harriet Harman, Labour’s deputy leader, said the party would “not be bullied” by The Sun’s decision while Tony Woodley, the Unite leader, raised a cheer on the conference floor when he tore up a copy of the paper