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Theresa May has been slammed for failing to appoint a social mobility tsar - three months after the last one quite over the government's dire record.

Former chair of the social mobility commission Alan Milburn stood down in December accusing the government of lacking the willingness and ability to deliver on “the crunch issue for our country”.

Quitting the post he hit out at the PM for months of “indecision, dysfunctionality and lack of leadership.”

Since he left in December he has not been replaced, while all ten seats on the Social Mobility Commission he ran still remain unfilled.

When she became prime minister, Mrs May made it her mission to tackling “burning injustices” in society from the moment she moved into Downing Street.

(Image: REX/Shutterstock)

But critics accuse of her of empty words on the issue of bridging the class divide.

Labour MP Lucy Powell, who sits on the Commons education committee, told the Sun on Sunday: “Yet again, the rhetoric just does not match the reality.

“Theresa May has made social mobility the priority of her government and yet she has left these positions unfilled for three months.

(Image: PA Archive/Press Association Images)

“Even before that, six positions had been vacant for over a year, which was one reason why Alan Milburn and his colleagues resigned.

“She needs to get a grip and find somebody to do this important job as a matter of urgency.

“Whatever internal squabbling has gone on, she must not offer these posts to members of a Tory chumocracy or to yes people.”

When former Labour minister Mr Milburn resigned in early December, all three remaining commissioners announced at they would be standing down, too.

Mr Milburn, who had been tsar since 2012, said at the time: “Talking the talk is all very well but you also need to walk the walk.

"The worst position in politics is to set out a proposition that you’re going to heal social divisions and then do nothing about it.

“There is only so long that you can continue to push water up hill.”