A multi-million-pound security operation is under way ahead of Donald Trump’s UK state visit, intended to create an impenetrable ring of steel around the US president.
President Trump’s three-day trip, from Monday, 3 June, at the invitation of the Queen, could cost more than £18m.
As the White House advance teams begin to arrive in Britain, what will the security operation involve and what hardware and staff will the president be bringing with him?
The president will arrive in the UK on his customised, high-spec aircraft Air Force One and is likely to touch down at Stansted Airport, north of London.
Air Force One isn’t actually a specific plane but instead refers to one of two specially adapted Boeing 747-200B series aircraft, which carry the tail codes 28000 and 29000.
However, on his latest trip to the UK, both jets could be in use.
According to US news reports, President Trump will be bringing all his adult children and their spouses, thus requiring a second plane.
With its advanced avionics and defences, Air Force One is classed as a military aircraft, designed to withstand an air attack.
It can jam enemy radar and eject flares to throw heat-seeking missiles off course.
It is also capable of refuelling midair, allowing it to fly for an unlimited time – crucial in an emergency.
Air Force One is also equipped with secure communications equipment, allowing the aircraft to function as a mobile command centre.
There are 85 onboard telephones, a collection of two-way radios and computer connections.
nside, the president and his travel companions enjoy 4,000 sq ft of floor space on three levels, including an extensive suite for the president, a medical facility with an operating table, a conference and dining room, two food preparation galleys that can feed 100 people at a time, and designated areas for the press, VIPs, security and secretarial staff.
Several cargo planes, including C-17 Globemaster transport aircraft, carry the president’s fleet of armoured vehicles and helicopters, landing in advance of his arrival.