After the US president says "Brexit is Brexit' and that he just wants the British people to be "happy", our political editor tweets the prime minister's response.

In a Commons debate about the cost of the visit, likely to "run into the millions", Labour MP Dennis Skinner did not mince his words.

"What on earth is the government playing at inviting this fascist Trump to come to Britain and cause all this mayhem that we've already heard from these benches, police from every part of the British isles?

"The prime minister, does she want to hold his hand again? Is that what it's all about?

"You're making a rod for your own back," he tells ministers.

Policing minister Nick Hurd responds, saying Mr Skinner is "entitled to his own robust views".

"The fact of the matter is President Trump is the democratically elected leader of the United States of America which is historically and is currently our most important ally and it's a hugely important relationship."

A presidential helicopter waits on the runway at Stansted airport to fly Donald Trump to London.

Mr Trump has left Brussels on board Air Force 1, our correspondent Claire Gibson says.

They have just taken off - slightly later than scheduled.

Danny Shaw
BBC Home Affairs Correspondent

Photographs of the overnight accommodation for several hundred officers involved in Mr Trump's visit were posted on Twitter.

They show rows of camp beds in a sports hall and yoga mats in a squash court.

The Police Federation said it was unfair to expect officers to work 12 or 15 hour shifts after sleeping in such conditions - it said there was also no access to hot water.

The National Police Chiefs' Council said Essex Police was trying to resolve the problems "at speed".

The Home Office said it would consider requests to reimburse forces in England and Wales for the policing costs of Mr Trump's visit; the Treasury has agreed to pay up to £5m for the costs in Scotland.

Downing Street is backing Mr Trump's calls for increased defence spending from the bulk of Nato countries.

A spokeswoman for Prime Minister Theresa May tells a Westminster briefing: "We have always been clear that we think it's right that Nato countries pull their weight to ensure collective security.

"There is an agreement to move towards 2% (of GDP) by 2024 but we think there is more to be done.

"We are already paying above the 2% target."

James Landale
Deputy political editor

Image source, PA

Donald Trump's trip to the UK will be the 12th by a US president. But this working, not state, visit is expected to be different to those that have gone before.

In 1977 Jimmy Carter came to Britain on his first overseas trip as president. His main aim was to attend the G7 summit in London, but he also chose to visit Newcastle.

This was how it used to be: British crowds cheering US presidents.

Read James' piece here.

After the two-day working part of his trip, Mr Trump will head north to Scotland for a game or two of golf.

He'll play at at the Trump International Golf Links at Menie, Aberdeenshire, and will visit Trump Turnberry, near Girvan, in South Ayrshire.

His middle son, Eric, 34, who oversees the golf resorts, will keep him company. He landed in Aberdeen earlier today.

PA news agency say it's understood that, despite speculation, the Duke of York - Prince Charles' young brother - will not join the president for a game.

Two significant protests are expected during the visit.

The first is planned for later on Thursday in Regent's Park, north London, near the US ambassador's residence, where Mr Trump will be spending the night.

Protesters plan to play recordings of children crying for their parents at a US detention centre, as a criticism of the president's borders policy.

Nearly 3,000 children were split from undocumented adults entering the US.

The second protest - and likely the bigger of the two - will see crowds converge on Whitehall on Friday afternoon.

The Met Police are preparing for 5,000 people to show up.

The Police Federation, which represents rank-and-file officers, warns the visit will put "unquestionable pressure" on police forces and complained that 300 officers will sleep on camp beds in a gymnasium without hot water and little in the way of hot food to cover their shift.

His Brussels press conference concludes, and Mr Trump is now on his way to the UK - and he's not alone.

When it comes to entourages, there can’t be many much bigger than Mr Trump’s.

Some 1,000 staff are keeping him company including Secret Service staff, military communications specialists and White House aides.

Mr Trump has a White House doctor at his side at all times and one of five rotating military aides who carry the nuclear "football" - equipped with communication tools and a book with prepared war plans.

There is always a group of 13 members of the press on such visits, including reporters, photographers, a television crew, and a radio reporter.

Image source, Reuters

Mr Trump goes on to reflect on a week of political turmoil in the UK that's seen the Foreign Secretary Boris Johnson and Brexit Secretary David Davis quit their posts.

"I am going to a pretty hotspot right now with a lot of resignations," he says.

On the matter of Brexit, which is behind deep divisions in the Conservative party, he says: "I would say Brexit is Brexit.

"The people voted to break it up so I would imagine that's what they would do, but maybe they're taking a different route - I don't know if that is what they voted for."

It seems as if the UK is "getting at least partially involved back with the European Union", he says.

"I'd like to see them be able to work it out so it could go quickly."

Image source, Reuters

Mr Trump is currently giving a press conference in Brussels following a Nato summit.

Asked about the protests expected to take place during his UK visit, he tells reporters: "They like me a lot in the UK. I think they agree with me on immigration.

"I think that's why Brexit happened."

Mr Trump and his wife Melania will attend a dinner, hosted by Mrs May, at Blenheim Palace - the ancestral home of Sir Winston Churchill.

The guest list includes Chancellor Philip Hammond, the new foreign secretary, Jeremy Hunt, and a host of business leaders.

Welcome to our live coverage of Donald Trump’s first visit to the UK since becoming US president in 2016.

He’s due to land on UK soil around lunchtime and we’ll be bringing you all the developments as they happen.

Expect large protests, a Trump-shaped blimp and a fair degree of pomp and ceremony.