Jeremy Corbyn will pledge to take on “vested interests supporting beings back”, as the Labour leader knocks off the party’s general election campaign.
In a addres on Thursday, Mr Corbyn will promise to “rebuild” public services and take on “the few who ranged a corrupted system”.
He will say the 12 December poll is a “once-in-a-generation chance to transform our country”.
However, Boris Johnson condemned him for refusing to allow Brexit to happen.
The prime minister said the UK’s failure to leave the EU by 31 October had been caused by Mr Corbyn “insisting upon more dither, more delay”.