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Matt Cannon, Toby Luckhurst and Shamaan Freeman-Powell
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Why President Trump isn't staying at Buckingham Palace
In a break with tradition, President Trump and the First Lady won't be staying at Buckingham Palace because of on-going renovations.
Instead they will be staying at the US ambassador's residence Winfield House, in central London's Regent's Park.
Both former presidents George W Bush and Barack Obama were accommodated at Buckingham Palace during their respective state visits.
What will happen on the visit?
The US President will receive a ceremonial welcome attended by the Queen, Prince of Wales and Duchess of Cornwall in the Buckingham Palace garden.
After the welcome, the Duke of Sussex will join the group for a private lunch at the palace.
Mr and Mrs Trump will then visit Westminster Abbey for a tour with the Duke of York.
They will also meet Prince Charles and the Duchess of Cornwall for tea at Clarence House.
On Monday evening, a state banquet in the palace's ballroom will take place with Mr Trump, the Queen, Prince Charles and the Duchess of Cornwall joined by the Duke and Duchess of Cambridge, along with other UK public figures and prominent Americans living in Britain.
Buckingham Palace prepares to welcome President
First Lady Melania Trump has an outfit change
Hunt gets handshakes at Stansted meet and greet
Foreign Secretary Jeremy Hunt was one of the first to greet the president when he stepped off the plane a few minutes ago.
Mr Trump has said Mr Hunt is one of the candidates for the Conservative party leadership he views most favourably.
President Trump and First Lady welcomed by Guard of Honour
President Trump and First Lady were greeted by US ambassador Woody Johnson and Foreign Secretary Jeremy Hunt.
President Trump and First Lady wave as they arrive
All eyes on Air Force One as UK awaits Trump
Why is Trump criticising the London Mayor?
Trump called Sadiq Khan a "stone cold loser".
In a tweet, Donald Trump called Sadiq Khan a "stone cold loser" and accused him of being "nasty".
It comes after Sadiq Khan said the UK should not be "rolling out the red carpet" for Donald Trump during the trip.
Mr Khan said he believed the prime minister should tell the president he was "wrong on a whole host of issues" such as his views on women and immigration.
But their feud isn't new. It first began in 2016 when Mr Trump challenged Mr Khan to an IQ test after Mr Khan said his views on Islam were "ignorant".
Read more about their feud here.
BreakingPresident Donald Trump lands in UK
President Trump arrives at Stansted airport with First Lady Melania Trump to begin their three-day official state visit.
Donald Trump calls Mayor of London Sadiq Khan a 'stone cold loser'
Melania Trump wears London inspired dress
The first lady prepared for her trip in style
Melania Trump's walked across the lawn of the White House in a Gucci dress covered with London landmarks, such as the Big Ben and Parliament, before she boarded Air Force One.
What mustn't Trump do when meeting the Queen?
Etiquette expert Diana Mather tells BBC Radio 5 Live there are some things that visiting dignitaries cannot do when meeting the Queen:
What exactly is a state visit?
It's a formal trip to the UK by a head of state and is normally at the invitation of the Queen, who acts on advice from the government.
Although they're grand occasions, they're not just ceremonial affairs - they're also used by the government to further what it sees as Britain's national interests.
The Queen usually receives one or two heads of state per year and has hosted 112 of these visits since becoming monarch in 1952.
Mr Trump will only be the third US president to make a state visit to the UK, but the Queen has met almost all the US presidents in office during that time, either in the UK or in the US.
Aircraft over skies of London
Towards the end of last week, people in London spotting aircraft flying over the capital - prompting some newspaper articles to explain that they were US military aircraft practising for President Trump's visit.
And this morning, one journalist from AFP tweeted that he'd seen helicopters over south London.
Stansted ready for president's arrival
The Essex airport tweets...
Helicopters ready for Mr Trump
US Marine Corps Sikorsky helicopters on the tarmac at Stansted
One hour to go...
Air Force One - the specially-converted Boeing 747 airliner which is used to transport the US president around the world - is due to break the flow of Ryanairs and Easyjets at Stansted Airport when it lands at 09:00 BST. Pictures from the Essex airport show the first US military helicopters arriving ready to take the president and his entourage into central London.
Transport for London announces road closures
'There are no real goals'
Maggie Haberman of the New York Times says Mr Trump is "very happy he was invited" for a state visit but there are "no real goals".
She says the president, his staff and family are more excited about meeting the Royal Family than almost any other aspect of the trip.
However, according to Haberman, a lot of White House officials have expressed trepidation and concern about why Mr Trump is bothering to have so many meetings with Prime Minister Theresa May, when her leadership is ending soon.