Donald Trump arrives in London today on his first Presidential visit
Thousands of officers will be on duty as Donald Trump's visit is met by the biggest UK police operation since the August 2011 riots.
Police from nearly every force have been called up for the US president's arrival, as demonstrators prepare to protest against his first trip to the UK.
Mr Trump is expected to avoid central London, where the bulk of protests will take place, instead visiting Blenheim Palace, Chequers, and Windsor Castle during his trip on Thursday and Friday.
Protests are taking place across Britain, including in Swansea and Cardiff, organised by Stand Up To Racism Wales and The Swansea Coalition Against War.
The group said, "This is the Swansea Protest Against Trumps visit.
"Please join us at the pedestrianised section of Princess Way running up from junction with Oxford St between 6-7pm.
"Let people know you oppose him.
"Make your voice heard against racism, sexism and war."
A crowdfunding page has been set up by the group trying to raise money to take people from Swansea to London for a big protest on Friday 13th July.
UK Security Costs
The security operation is estimated to cost between £8m and £10m and will put police under "unquestionable pressure", according to Police Federation chairman Simon Kempton, who said operations were likely to become "merely reactive" during the visit.
Police specialists from firearms, public order, traffic and special escort teams will all be involved in making sure the controversial trip goes smoothly.
Assistant Chief Constable Chris Shead, from the National Police Coordination Centre, said: "Police forces are working together on a significant, multi-faceted security operation supporting the presidential visit to the UK.
"Nearly all police forces in England and Wales are providing officers and resources to assist with the operations in areas hosting the visit."
Police chiefs have warned the massive deployment will have an impact for months, as officers take days off for Trump-related overtime and potentially cause difficulty for colleagues left behind.
The president comes to the UK from a NATO summit where he again ruffled feathers, claiming Germany was "captive" to Russia over its energy supply; and suggesting members should commit to spending 4% of their GDP on defence - double the current goal.
While in the UK, he is set to travel between locations in his bulletproof "Beast" limousine, surrounded by dozens of police and security service vehicles.
The car is a unique Cadillac built upon a medium-duty truck platform.
It is equipped with many life-saving, offensive, and defensive measures, and is built to the United States Secret Service's standards.
American video network 'The Hub' said, "It's doubtful there is a more heavily armoured vehicle anywhere in the world." The entertainment channel also says the doors on the limo weigh as much as those on a boeing 757 aircraft.
Other features allegedly included on the US President's car-shaped tank-mobile include:
- The doors of the presidential state car have no keyholes and passenger doors can only be opened in a way known only by the Secret Service.
- Only the window at the driver's seat opens (to pay tolls).
- It boasts rocket-propelled grenades, night vision optics, a tear gas cannon, on-board oxygen tanks, and an armoured fuel tank filled with foam to prevent explosion.
- Two pints of blood are also kept on-board in the president's blood type.
- It can also apparently fire "multi-spectrum infrared smoke grenades as a counter-measure to a rocket-propelled grenade attack or anti-tank missiles.
The car features 8-inch (200 mm)-thick doors.
As well as meeting the Queen at Windsor, also on Mr Trump's schedule is a journey to Scotland where he owns two golf courses and will spend the weekend.
Mr Trump this week described the UK as a country "in turmoil", alluding to the political drama that saw David Davis and Boris Johnson ministers resign over the prime minister's Brexit plans.
He said it was "up to the people" whether Theresa May remains as PM and suggested he would make time to visit his "friend", former foreign secretary Mr Johnson.