That is all from STV News' live coverage of Liz Truss becoming the UK's new Prime Minister.

She will face Labour leader Sir Keir Starmer at Prime Minister's Questions in the House of Commons tomorrow.

Keep across the STV News website and social media channels for all the latest developments as Truss' reign gets up and running.

US President Joe Biden has congratulated Liz Truss on becoming Prime Minister,

He tweeted: "I look forward to deepening the special relationship between our countries and working in close cooperation on global challenges, including continued support for Ukraine as it defends itself against Russian aggression."

Truss said she would pursue three early priorities as Prime Minister: Tax cuts and reforms, deal with soaring energy bills and securing the energy supply, and also put the NHS “on a firm footing”.

In her first speech as the UK's leader, she said: “Firstly, I will get Britain working again. I have a bold plan to grow the economy through tax cuts and reform.

“I will cut taxes to reward hard work and boost business-led growth and investment.

“I will drive reform in my mission to get the United Kingdom working, building and growing.

“We will get spades in the ground to make sure people are not facing unaffordable energy bills and we will also make sure that we are building hospitals, schools, roads and broadband”.

On her second and third immediate priorities, Liz Truss said: “Secondly, I will deal hands-on with the energy crisis caused by Putin’s war.

“I will take action this week to deal with energy bills and to secure our future energy supply.

“Thirdly, I will make sure that people can get doctor’s appointments and the NHS services they need. We will put our health service on a firm footing.

“By delivering on the economy, on energy and on the NHS, we will put our nation on the path to long-term success”.

New Prime Minister Liz Truss paid tribute to Boris Johnson and said she was honoured to take over the responsibility at a “vital time” for the UK.

Speaking outside No 10 Downing Street after the downpours of rain abated, she said: “Boris Johnson delivered Brexit, the Covid vaccine and stood up to Russian aggression. History will see him as a hugely consequential prime minister.

“I’m honoured to take on this responsibility at a vital time for our country.”

The rain is lashing down in London and the lectern in front of 10 Downing Street has been moved to the side.

Truss is just moments away from arriving.

The crowd of MPs who had gathered in the street to welcome Truss briefly moved indoors but are now back outside.

Liz Truss supporters are gathering at Downing Street ahead of the new Prime Minister's imminent arrival.  

Senior Tory Sir Bernard Jenkin has urged Liz Truss to “level with the British people” about the “utterly dire situation” the country faces in her first speech as Prime Minister.

“I hope this afternoon that in her remarks from Downing Street, which are planned later, she will level with the British people about how utterly dire the situation is,” the Liaison Committee chairman told BBC Radio 4’s World at One programme.

“We’re looking at kind of five horses of apocalypse coming at the same time, a perfect storm of crises – not just the cost-of-living crisis, not just the energy crisis, we have state-on-state war in Europe for the first time since 1945, we have embedded inflation and the public finances are already shot to pieces”.

He added that “she’s got to prepare people, we’re not in sunny uplands”, while warning that the freezing of energy bills “is a short-term fix” as the war in Ukraine could go on for years.

Liz Truss is currently flying back to London from Aberdeen.

She will give her first speech as Prime Minister from Downing Street this afternoon.

A busy day already and our man for all seasons Steven Brown is at Balmoral to recap everything that has happened so far.

One thing is for certain, the STV umbrella budget is showing its worth.

Former Tory leader Sir Iain Duncan Smith has said he was offered a position in Liz Truss’s new cabinet but had turned it down.

Sir Iain, who was a prominent supporter of the new Prime Minister in the leadership contest, suggested he would have had to “give up quite a lot of other things” to do it and that he was happy to remain on the backbenches.

“I have been offered (a job) and said I won’t be taking it up. I’m going back to the backbenches again,” he told BBC Radio 4’s The World at One.

“I am very happy to support her. Sometimes in life you have got to figure out whether you add value to a particular job that you are being asked to do.

“It is all about what I can do and I am very happy to be on the backbenches for the moment.”