Jeremy Corbyn has received a hero's welcome as he took the stage to set out his vision at Labour's conference in Brighton.
The leader said Labour was "ready for government" and promised to sweep away a "degraded" political system which led to the Grenfell Tower disaster.
He took to the stage minutes after his deputy, Tom Watson, suggested Labour could hold a second referendum on Brexit, saying: "We're not ruling it out."
In his keynote speech, Mr Corbyn will accuse Government ministers of "bungling" Brexit talks and tell them to "pull yourselves together or make way" for Labour.
One of the Labour leader's closest shadow cabinet allies, Angela Rayner, earlier told Sky News that Mr Corbyn has shown he is "prime minister material" and would be able to "run Britain and run the economy better than Theresa May".
But a poll in The Times found that voters prefer Mrs May as PM by a margin of 37% to 29% over Mr Corbyn, even while Labour stretches its lead over the Tories to four points, on 43% to 39%.
Mr Corbyn, who earlier this week suggested he could be in 10 Downing Street for a decade, will use his speech to try to show that Labour is planning for the long term, setting out his intention to "manage" the introduction of new technologies in a way that ensured ordinary people would benefit in terms of more leisure time and higher wages.
And he will reaffirm his commitment to providing free tuition in further education colleges to enable workers to retrain for the new jobs being created by automation and robotics, at an annual cost of £2.5 billion by the end of the next Parliament.
Mr Corbyn will say that the Grenfell Tower fire in west London in June, which killed around 80 people, was a symbol of a "degraded" system of "rampant inequality, the hollowing out of our public services, the disdain for the powerless and the poor" which has held sway in the UK since the days of Margaret Thatcher.
The blaze was not just "the result of bad political decisions" but stood for "a failed and broken system, which Labour must and will replace", Mr Corbyn will say.
And he will say that Labour is now a government-in-waiting whose policies represent a "new common sense" shared by the mainstream of British people.
