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Gordon Brown has warned the Labour party to choose its next leader carefully.
Brown did not mention Jeremy Corbyn by name in his intervention on Sunday, but it was clear the former prime minister was warning against voting Corbyn in as the party's next leader.
ITV News's political correspondent Libby Wiener reports:
Lance Price, the former director of communications for the Labour party, has told ITV News he hopes those voting in the party's leadership election will listen to Gordon Brown.
Mr Price said he believed the former prime minister was able to "reach parts of the party" that others, like Tony Blair, could not.
Gordon Brown has said he is "not here to attack any individual candidate" but says that the only way for Labour to achieve "high ideals" is to be credible, radical and electable.
Gordon Brown has called for Labour to remain a party of power and not protest in order to "make a difference in people's lives".
ITV News Political Correspondent Libby Wiener has tweeted:
Former prime minister Gordon Brown has said Labour can only deliver on its principles in power.
"Leaders come and leaders go, I know that," Mr Brown said at London's Southbank Centre as he began his speech with a call for the party to continue its "mission" to "advance social justice".
"We can only measure the progress we make by the difference we make in people's lives," he added.
"It is not an abandonment of principles to seek power and to use that power in government. It is the realisation of principles."
The newly elected Scottish Labour leader has said the long and increasingly petty campaign to replace Ed Miliband is letting David Cameron off the hook.
Kezia Dugdale, who was elected yesterday, said she was concerned that the party leadership contest south of the border would hinder its ability to be an effective opposition in the meantime.
Dugdale also questioned Jeremy Corbyn's willingness to be prime minister, but acknowledged that his popularity and "big ideas" are exciting the country.
Earlier this month, she had questioned how "a guy that's broken the whip 500 times" can enforce party discipline, in an interview with The Guardian.
Jeremy Corbyn will today set out his plans for "better business" promising to stand up for small businesses and clamp down on corporate tax avoiders.
It comes as former prime minister and chancellor Gordon Brown prepares to give a speech on the future of the Labour Party this afternoon.
Among the proposed policies are a freeze on tax rates for small businesses, a national investment bank, fair rents for local shops and more resources for HMRC to tackle corporate tax avoidance.
Gordon Brown will make a high-profile intervention in the Labour leadership contest with a keynote speech at London's Southbank Centre.
While he is not expected to endorse any of the four candidates in the race, Mr Brown's address is expected to distance himself from the policies of front-runner Jeremy Corbyn.
The speech on "power for a purpose" is expected to call for Labour to realign itself on the economy.
Mr Brown's intervention comes after several public attempts by his predecessor in power Tony Blair to warn against a Corbyn victory.
Latest ITV News reports
Former PM avoided naming any Labour leadership candidates in his speech, but appeared to make a veiled warning against electing Corbyn.
A poll rates Jeremy Corbyn as the leadership candidate both most likely to improve Labour's fortunes and damage the party's chances.