The man, an account by trade, was caught by a security guard at a popular womens' clothing store.
Fire crews have been fighting the blaze since late Wednesday night.
The man was left "absolutely traumatized" by the incident and has not been able to return to work.
The president's trip appears to have been something of a triumph, even in the eyes of his typical detractors.
A group of anti-Trump protesters threw yet another milkshake Tuesday, sparking a fight with a Trump supporter in London's Parliament Square.
"We expect our president ... to represent all Americans with dignity with grace, and the president hasn't done that," former ambassador to NATO Nick Burns said.
Campaign group Led By Donkeys uses recent USS John McCain saga to poke fun at President Donald Trump during his U.K. state visit.
Tens of thousands of people are expected to hit the streets of London on Tuesday to show the world how they feel about President Donald Trump, including Americans living abroad.
Museum of London Director Sharon Ament said the museum is in "strong dialogue" with Trump Baby's creators to install the blimp in its permanent protest collection.
Interviews with the president took pride of place in national newspapers this weekend, though Trump's controversial comments have won him little support from the British people.
The blimp of President Donald Trump in a diaper was a feature of protests during his visit last year.
The "device" was a giant, glittery festive ornament.
An armed man ran into a mosque in London and fired a blank round before Ramadan worshipers chased him out. Police said they did not consider the incident terrorism-related.
President Donald Trump and London Mayor Sadiq Khan have clashed repeatedly over a number of issues.
"We need to remind people of how France, and Europe, have recovered from other tragedies," said Francis Maude, a London-based conservation repair specialist.
"Ecuador has made these allegations to justify the unlawful and extraordinary act of letting police come inside an embassy," said WikiLeaks founder Julian Assange's lawyer.
Lauren London, the girlfriend to late rapper Nipsey Hussle, said he would burn sage each morning.
Ecuadorian President Lenín Moreno reportedly described Julian Assange as a "brat" after withdrawing the WikiLeaks founder's asylum status.
"WikiLeaks, I love WikiLeaks," Donald Trump said during an October 2016 campaign rally.
"The hand of 'democracy' squeezes the throat of freedom," Russian Foreign Ministry spokesperson Maria Zakharova wrote on Facebook.
"Images of Ecuador's ambassador inviting the U.K.'s secret police into the embassy to drag a publisher of—like it or not—award-winning journalism out of the building are going to end up in the history books," Edward Snowden said.
British police entered the Ecuadorian Embassy and arrested WikkLeaks founder Julain Assange after Ecuador stripped him of his asylum status.
Kirstjen Nielsen, who recently resigned as homeland security secretary, was on a trip to meet European allies as President Donald Trump threatened to shut down the U.S.-Mexico border.
In 2012, WikiLeaks founder Julian Assange sought asylum in the Ecuadorian Embassy in London, and he has not stepped out of the building since.
"Five members of cabin crew became sick on flight, one passenger on board the flight tweeted.
Merle Groenewald, 58, alleges she was hurt when a "sexy fireman" threw his pants into the crowd.