(London): Theresa May promised to build a "better Britain" and to make the UK's EU exit a "success" after she was announced as the new Tory leader and soon-to-be PM.

Speaking outside Parliament, Mrs May said she was "honoured and humbled" to succeed David Cameron, after her only rival in the race withdrew on Monday.

Mr Cameron will tender his resignation to the Queen after PMQs on Wednesday.

Mr Cameron, who has been UK prime minister since 2010, decided to quit after the UK's Brexit vote.

It follows another day of dramatic developments in the political world, when Andrea Leadsom unexpectedly quit the two-way Conservative leadership contest, saying she did not have the support to build "a strong and stable government".

Her decision left Mrs May - the front runner - as the only candidate to take over leading the party and to therefore become prime minister.