I want to apologise and say sorry to Stuart Holmes, who is a passionate campaigner and well known to everyone who attends party conferences and was perfectly entitled to do as he did on Tuesday in trying to get attention for his causes.
It was totally out of character for me to react to him in the way I did.
I also want to apologise for the blogpost I wrote after the incident.
It was full of absurd bravado and in the heat of the moment I behaved in a frankly idiotic way.
In addition, having accepted my guilt, I feel I should make some sort of reparation to Mr Holmes.
I will pay for a new placard for him and also make a donation to a charity of his choice.
Former Labour spin doctor Damian McBride has denied his controversial memoirs will damage the election ambitions of Ed Miliband, saying the party leader comes out well in his book Power Trip.
"I don't think this will make any difference to the way people vote at the next election," McBride told ITV's Daybreak, saying Miliband and shadow chancellor Ed Balls were "not involved" in any of his activities while he worked for Gordon Brown.
"I make no excuses for my behaviour and don't expect anyone else to," added McBride, who said he had operated in a political system that was "unacceptable" and "cut-throat".
Gordon Brown has refused to answer questions over revelations made by his former spin doctor Damian McBride.
Mr Brown was at an event to unveil a UN-backed initiative on educating children displaced in Syria’s civil war when he was repeatedly asked by a Telegraph journalist if he condoned Mr McBride's actions which have been revealed as his new memoir has been serialised in the Daily Mail.
However the former Prime Minister appeared to completely ignore all questions regarding Mr McBride.
Labour's former spin doctor Damian McBride said he was "ashamed" of the way he treated Labour politicians he saw as rivals to Mr Brown, but he insisted he did not break the law, and said he would be happy to speak to police if they decide to look into complaints from a Conservative MP.
Mr McBride said he did not believe that Ed Miliband and Ed Balls were aware of the details of his briefing activities when he was working for Gordon Brown and added that he was ready to give up his pension if the civil service felt he should.
Mr McBride said:
"I feel ashamed and sorry to those individuals whose careers I affected and even more so to the innocent bystanders that got in the way - special advisers who lost their jobs as a result of them being pushed out of government, people that were mentioned in the context of these sleazy stories."