Why did Andrea Leadsom step down?

She claimed it was in the best interests of the country. 'A nine-week leadership campaign at such a critical moment for our country is highly undesirable', she said.

She has been under mounting pressure to stand aside amid questions about her CV and her judgement. It also follows an interview in The Times on Saturday in which she said being a mother gave her a real stake in the future of the country. It was inevitably framed against her rival Theresa May who does not have children.

What does it mean for the leadership contest?

Theresa May is the only remaining candidate. She is expected to be given a formal endorsement as leader from the party board this evening.

When will Theresa May become prime minister?

It is not clear what the timeline will be yet. David Cameron will have to tender his resignation to the Queen before Theresa May can become prime minister. The Queen is not currently in London and has no plans to return to the capital before Wednesday.

It is likely that Mr Cameron will want to hold one last prime minister's question session in the House of Commons before he hands over.

But it seems like it will be soon. Chancellor George Osborne, a close ally of Mr Cameron, said Mrs May should be prime minister within the next few days.

Will there be another general election.

The Labour Party and the Liberal Democrats have already demanded that an election is held. Under the current law there will not be a general election until 2020. But Mrs May said last week that she would not call a snap election if she became leader.

And most importantly, does Larry the Number 10 cat get to stay?

Yes. While the Cameron family will have to move out of the grace and favour home, Larry, the Downing Street cat, will continue to live behind the famous front door and keep on top of the mice.