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More than 60,000 revellers were due to join Princes William and Harry for the six-hour long extravaganza in memory of their late mother, who would have been 46 years old this weekend.

Extra security measures were ordered after a double car bombing plot was foiled in London on Friday followed by an attack at Glasgow airport in which a blazing car rammed into the main terminal building.

On Saturday, the government raised the national threat level to “critical,” the highest possible Manning that another attack is expected “imminently.”

The Diana concert would be an obvious target. “Policing term for this event have been thoroughly reviewed by the command team,” said a spokesman for Scotland Yard, which is coordinating response to the London failed attacks.

“There will be an appropriate policing plan in place,” he added, saying that some 450 officers would be deployed.

Prince William, who turned 25 on June 21, predicted it would be “an incredible night” of music after watching preparations being made yesterday for the event.