Justine Greening has told the BBC she will continue to work outside government to do everything she can to promote equality of opportunity "for young people wherever they are growing up and whatever their circumstances".

After her surprise exit from office, she said "social mobility matters to me and our country more than a ministerial career - especially to young people".

The BBC understands she was reluctant to be moved from her role less than a month after launching the government's social mobility strategy, and after Jeremy Hunt was allowed to argue to stay in his role at Health.

Claire Perry has arrived at Downing Street. This suggests the energy minister is in line for a promotion.

Education Secretary Justine Greening's departure won't help attempts to improve the gender balance in the cabinet.

Before the reshuffle she was one of only six full members of the cabinet and Theresa May clearly was keen to keep her within her top team, albeit not in the job she wanted.

Ms Greening, who was also minister for women and equalities, revealed she was in a same sex relationship in June 2016 when she was international development secretary.

Prior to that, she was transport secretary, having been MP for the south-west London constituency of Putney since 2005.

Damian Hinds is the new education secretary, replacing Justine Greening who has quit the government.

Mr Hinds was previously an employment minister.

Who could replace Justine Greening at education?

Employment minister Damian Hinds has been in Downing Street for more than an hour while Esther McVey, a former minister who is currently in the whip's office, has just entered No 10.

Education Secretary Justine Greening has quit the government after refusing a job at Work and Pensions.

Laura Kuenssberg
BBC political editor

The reshuffle isn't over, but we already know that it was not just the prime minister who had her say today, but her ministers too.

Jeremy Hunt, who has stayed as health secretary, and Greg Clark, who has stayed as business secretary, were both in No 10 for more than an hour this afternoon.

I understand that rather than meekly accepting whatever was being dangled before him (at least one of the likely jobs was a move to become business secretary, possibly a job swap with Greg Clark) the Health Secretary in fact argued his case for staying put and expanding his role to take on planning for the future of social care in England.

Read Laura's full blog on the reshuffle

Michael Gove remains as secretary of state for the environment, food and rural affairs. He leaves No 10 briskly and gets into his ministerial car, undoubtedly keen to get back to work.

Another minister staying in her job is Penny Mordaunt as international development secretary.

To be fair, she has only been doing the role since early November, when she succeeded Priti Patel.

The environment secretary Michael Gove has entered No 10. There are still several big jobs up for grabs, including work and pensions and his old stomping ground of education. But it would be a big surprise if he was to move from his current role.

Chris Grayling has been re-appointed as transport secretary, it is confirmed.

At one point this morning, it looked like he would become Tory party chairman but he retains a job he has held since July 2016.

Laura Kuenssberg
BBC political editor

Image source, EPA

Jeremy Hunt argued "strongly and passionately" to stay on in his job as Secretary of State for Health, the BBC understands.

In what was a "fluid" situation, Mr Hunt was able to "persuade" the prime minister not just that he should stay at health but also take on responsibility for the future of social care policy, which was being developed by the Cabinet Office.

It is understood the discussion between the prime minister and Mr Hunt had "knock on" effects on the rest of the reshuffle.

It’s understood he did not stay at health because Greg Clark refused to move. Sources close to Mr Clark say, in fact, that Theresa May did not discuss him leaving his role this afternoon.

As predicted, Liam Fox is staying put as Secretary of State for International Trade and President of the Board of Trade.

Matt Hancock is the new Secretary of State for culture, media, digital and sport.