The man stopped by police with a Taser stun gun as he ran towards Buckingham Palace wielding two knives once stood for election as a Tory councillor.
Talhat Rehman, 54, broke from a crowd of tourists in the middle of the Changing of the Guard ceremony yesterday morning, holding one blade to his chest and another to his throat.
As an officer tried to intervene, he lunged at him waving both knives and was shot with the stun gun before being arrested and taken away in a police van.
Mr Rehman, of Harrow, North West London, was later charged with two counts of possessing a bladed weapon in public and one of affray. He will appear at Westminster Magistrates’ Court later today.
His son, Kassum Rajam, confirmed that his father ran as a Conservative candidate for Brent Council in North West London in May 2002.
However, he was unsuccessful and never stood for election again.
“He was not making threats to members of the public but he was challenged by police. He acted aggressively and a Taser was discharged,” a Scotland Yard spokesman said.
Officers at the scene suggested that Mr Rehman was known to them.
A police cordon was thrown around the scene just 30 metres from the palace gates.
The two knives Mr Rehman had been carrying, an Afghan-style hat, a set of prayer beads and his high-top trainers remained within the cordon alongside Taser barb, the wire released as the electrical current is discharged from the gun.
The Band of the Grenadier Guards played on through the melee as baffled tourists watched the incident unfold shortly before 12pm.
Josh Greenberg, a sixth-form student at St Paul’s School in London, said: “I was walking past the palace, heard some commotion in the area next to the Victoria Memorial [and] looked to my right, the guy ran out into the middle of the square with a knife at his neck.
“Within a few seconds he was surrounded by police horses and officers on foot. Less than two minutes later a car came with officers with Tasers.
“One stood in front of him and the other went around from behind and discharged the Taser then the police got him on the floor, kicked the knives away and put him in the back of a van.
“He was shouting but it was quite unintelligible. Police were clearly telling him to drop the knife and instructing public to get back.”
A video posted online showed Mr Rehman standing alone near the Victoria Memorial.
A mounted policewoman yelled at the crowds to move back as he held one of the blades to his throat. As the officer pointed the Taser in his direction he lurched at him, waving the knives in the air.
As he fell to the ground he was quickly surrounded by officers who checked him over before carrying him away.The Queen and the Duke of Edinburgh were at Sandringham at the time of the incident.
In the last three years, police have used Tasers on at least 78 people to stop them killing or hurting themselves, according to figures obtained under Freedom of Information laws.
The Metropolitan Police used Tasers 224 times between October 1 2010 and March 31 2011.