The US President and the First Lady will land at Stansted Airport, Essex, to start his visit to London and the south of England.
"So that was the full planning that went into it - 10 pints of stout and, you know, late-night conversation."
"It's the office of the President that's coming to the UK".
Similar protests are planned on Thursday evening outside the U.S. ambassador's home at Regent's Park and in Scotland when Mr Trump visits on Saturday.
"Give us your tired and your oppressed and we'll divide you from your children", he said mockingly of Mr. Trump's policies.
In the Tuesday memo, the U.S. Embassy in London alerted citizens to the "numerous demonstrations" that could "attract large crowds" that may be less than agreeable toward Americans.
Top it off with the introduction of trade policies that have targeted some European industries - even though European nations are longtime friends accustomed to easy trade with the USA - and it is not surprising that Trump's itinerary will keep him out of central London on Friday, when large protests are planned.
Trump and US First Lady Melania Trump touched down in their Air Force One at Stansted Airport in the east of England from the North Atlantic Treaty Organisation summit in Brussels. See PA story POLITICS Trump. The proposal was debated in parliament where Trump was heavily criticized.
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May is trying to unify her deeply divided Conservative Party behind her Brexit plans with some of her own lawmakers openly speaking of a leadership challenge.
A 20-foot-tall blimp depicting President Trump as a cartoon baby stands inflated in London's Bingfield Park.
Some 77 per cent of Britons have an unfavourable view of Trump, according to a poll by YouGov with 1,648 respondents.
He is due to stay overnight at the ambassador's Winfield House residence in London's Regent's Park, where demonstrators plan to play recordings of migrant children held in United States detention centres.
Later, Trump will go to Windsor Castle for tea with 92-year-old Queen Elizabeth.
May will host a black-tie dinner for Trump there, attended by senior ministers and about 100 business leaders, including from Blackstone group, Blackrock, Diageo, McLaren and Arup.
Russia, Brexit and the Middle East are set to top the agenda.