Mr Miliband was elected leader in a ballot of MPs, MEPs, party members and trade unionists Ed Miliband is due to deliver his first big speech as Labour leader, promising “different ways” of doing politics.
BBC political editor Nick Robinson said Mr Miliband would declare he was part of Labour’s “new generation”.
In a speech which his aides say will have a “tone of humility”, he is set to signal a move away from the policies of the Blair-Brown era.
He is expected to sympathise with “anger at a Labour government that claimed it could end boom and bust”.
Mr Miliband, who won the leadership by just over 1% of votes, will address delegates at the Labour conference in Manchester.
He said he is his “own man” and told the BBC Labour would not “lurch to the left” under his leadership. But he has also said the “era of New Labour has passed”.
“ It is… an elaborate code to say ‘I’m not Tony Blair, and I’m not my old boss, and close ally and friend, Gordon Brown either’”
He told reporters on Monday: “New Labour was right for its time and there are many aspects of New Labour that we will retain, like the idea that we appeal to all sections of society, that we are for wealth creation as well the distribution of wealth.
“But it came to be associated with a particular style and nature of politics and actually it got stuck in its old certainties itself and I will be saying that in a speech on Tuesday and I will be saying more about my vision of where we go as a party then.”
“It’s about us showing to the country that we understand why we lost the general election and us showing humility to the country. I think the country are more interested in what I have to say to them rather than details of the shadow cabinet.”
The BBC’s Nick Robinson said Mr Miliband will say that as leader he will have “different ideas, different attitudes, different ways of doing things”.
This could be “an elaborate code to say ‘I’m not Tony Blair, and I’m not my old boss, and close ally and friend, Gordon Brown either”, Nick Robinson said, adding:
“What he’ll say, I’m told, is that Labour was at its best when it challenged the old ways of doing things, things like, for example, introducing gay rights or the minimum wage, at its weakest when it accepted the old orthodoxies.”
Mr Miliband, 40, won the leadership by just over 1% from his brother David after second, third and fourth preference votes came into play.
David Miliband won a majority of support from Labour’s MPs at Westminster and party members, but Ed was ahead among members of trade unions and affiliated organisations in Labour’s electoral college voting system.
In a speech on Monday, David Miliband urged party unity, saying he was proud of his younger brother: “No more cliques, no more factions, no more soap opera – one united Labour Party taking on a divided government.”
“We have a great new leader and we all have to get behind him,” he said.
He has yet to say if he will serve in his brother’s shadow cabinet.
A spokesman for David Miliband said he would not make a decision on his future until Wednesday, the deadline day for frontbench nominations, and anything in Tuesday’s newspapers was “pure speculation”.
The BBC’s Iain Watson says his team are frustrated that the media appear to want a running commentary on his thinking – and say whatever decision he takes will be in the best interests of Ed.
“But David Miliband’s supporters are concerned, were he to stand, that Labour’s media opponents would report even minor differences of emphasis with his brother as splits, and would suggest that psychodrama of the Blair/Brown era is returning with a vengeance,” he said.
“And while they are emphasising the problems of serving under his brother, they are not sketching out any potential benefits.”
This article is from the BBC News website. © British Broadcasting Corporation, The BBC is not responsible for the content of external internet sites.