Vicki Young
Chief Political Correspondent

Penny Mordaunt really was seen as a perfect fit as defence secretary, with her background as a Royal Naval reservist.

She doesn't say why she has returned to the backbenches, but the rumour was that Jeremy Hunt had been offered the defence role and turned it down.

It does seem quite extraordinary though, as she didn't back Boris Johnson, but she did back Brexit and she is a woman - when the new PM is saying he wants a more diverse cabinet.

We can presume she has been offered something else, but saw it as a demotion.

But it shows that maybe it is not all going to plan so far for the new PM.

In a wide-ranging speech outside No.10, Mr Johnson made promises on a variety of subjects.

Those promises included:

• To leave the EU by 31 October
• To negotiate a new withdrawal agreement with the EU

• To recruit 20,000 new police officers
• To ensure the wait to see a GP is less than three weeks
• To provide "20 new hospital upgrades"
• To fix the social care "crisis"

• To increase funding for primary and secondary schools
• To unite the country
• To deliver "higher wages, a higher living wage, higher productivity"
• To tackle climate change and create green jobs
• To boost the UK's biotech and space science sectors
• To change tax rules to incentivise investment
• To do more to promote the welfare of animals
• To ensure EU citizens have the right to remain in the UK after Brexit

The new PM's speech "was all rhetoric - there's nothing in it" says shadow Brexit secretary Sir Keir Starmer.

"For three years he's got away with glib comments and remarks that have gone down well with the party faithful, but now [he's facing] the reality of leadership and actually demonstrating by action what's going to happen.

"The only thing we've seen of that is when he was foreign secretary and there was a massive mismatch between what he said and what he was able to do.

"The focus at the moment is on how we in the UK don't want to leave without a deal. There is an alliance, a majority in Parliament, to stop that happening.

"And that is going to be a test - he says 'do or die, we are leaving on 31st October' - but parliament won''t let us leave without a deal.

"There is going to be a crunch point, probably in the early autumn, when what Boris says and reality collide.

"At that point i think Parliament is going to say, you simply can't drag us out of the EU without a deal."

Jonathan Blake
BBC political correspondent

Striding purposefully up the street - Boris Johnson wasted no time in setting out his stall as a Prime Minister that will deliver Brexit

"The time has come to act" he said.

He quickly turned to his familiar scorn for "pessimists" who say the country's "incapable" - doubters, doomsters, gloomsters, were going to get it wrong again.

His delivery was a little slower, more sober than during the speeches he made during the leadership campaign.

More prime ministerial, perhaps, than the off-the-cuff kipper-waving performances we've become used to in the last few weeks.

But it was still very much Boris Johnson, excitedly speeding up and waving his hands and banging the lecturn every now and then.

Police, broadband, social care - the promises were familiar too.

A no-deal Brexit was a "remote" possibility, but one that it was "common sense" to prepare for.

On a whole host of other projects he said it was time to "get going now" - he will never, until the next election at least, have more political capital than he does now.

He ended by talking of the "pluck, nerve and ambition" of the United Kingdom.

He could well have been talking about himself.

Reality Check

Image source, Getty Images

Boris Johnson, speaking on the steps of Downing Street, declared that in the event of a no-deal Brexit the UK “will have that extra lubrication of the £39bn”.

The prime minister is referring to the estimated sum the UK has agreed to pay the EU to settle all of its obligations.

The settlement formed part of Theresa May’s Brexit deal – known as the Withdrawal Agreement.

After a no-deal Brexit, the UK will no longer be bound by the European Court of Justice – so in theory it could hold on to the money.

However, there could still be some legal ramifications – although no one is quite sure what would happen. The Institute for Government thinktank, for example, says refusing to pay could land the UK in the International Court of Justice in the Hague.

But even if there were no legal consequences, the EU has said it won't start negotiating a free trade deal until a number of issues, including the money, are sorted first.

- Read more here

Damian Grammaticas
Europe correspondent

Boris Johnson has doubled down on things he was saying during the leadership campaign.

He says he wants to do a new deal, do away with the Irish backstop, and all of that is very concerning for the EU.

The question from the EU though will be "how?" What does Mr Johnson envisage in its place?

There were a couple of things the EU will welcome - such as his talk of a partnership and a guarantee for citizens' rights.

But what would really have signalled alarm bells, was words sounding to EU ears like he is trying to shift the blame onto them.

BBC News

Jo Swinson - the new leader of the Liberal Democrats - said people would be "dismayed" at the speech as it was all "bluster" from Boris Johnson.

She says he seems "determined to crash out" of the EU without a deal on 31 October.

Ms Swinson adds: "He can say what he likes, but the reality is he is pursuing a policy that is hugely irresponsible and is going to harm our country."

The Lib Dem leader says she was keen to work across party on issues such as social care.

But she adds: "We have heard Boris Johnson say a lot in the past, but the action on delivering does not always match the rhetoric."

Laura Kuenssberg
BBC political editor

The BBC's political editor says there's "frenzied speculation on who is up and who is out in the new administration".

Many of big jobs will go to convinced Brexiteers to show the new PM's commitment to leaving the EU at the end of October, she says.

"Beyond that Boris will have a balanced cabinet, " she said. "They will have people who were on the Remain side of the argument. But the appointments will give an overriding sense of what they are trying to show, which is that that they mean it about sticking to that deadline."

"People close to Boris Johnson believe if he can't stick to that deadline, he might be done."