He added: "He is the candidate to drive through the change that ordinary people are crying out for - opposing damaging austerity measures and tackling the housing crisis which is causing misery for so many.

"It's policies like Jeremy's announcement on extending the recognition for trade unions which we believe will make a real difference to the working lives of millions. Jeremy is a leader for the millions, not the millionaires, and the CWU is proud to support him."

Corbyn pledges to end 'rip off Britain'

The Labour leader pledged to end "rip off Britain" if he wins the next general election and tackle abuses such as zero hours contracts.

Mr Corbyn laid out a series of pledges aimed at tackling "injustices" in the workplace he said had been highlighted by recent "scandals" at Sports Direct and BHS.

He said a Labour government would ban zero hours contracts, repeal the controversial Trade Union Act which places restrictions on strike ballots and increase the living wage.

"It's time to end rip off Britain and protect workers' rights," he said to loud applause from CWU activists.