More than 5,000 cops from throughout the UK supported 10 days of ceremonial occasions to mark the death of Queen Elizabeth II.
The number of officers drafted in to assist occasions in Scotland, London, Windsor and Norfolk would make up the fifth largest police pressure in England and Wales, with tens of hundreds of extra officers supporting occasions domestically.
Chief Constable Lucy D’Orsi, gold commander for Operation London Bridge, said: “From a policing perspective, I think it’s been an enormous success.
“What made this operation different to ones we routinely do is that there was no notice.
“The operation starts from the minute that we were aware of the death of Her Majesty and that makes it fundamentally different to any other operation.”
She added that it was “too early to tell” the total cost of the operation, which was the most important ever ceremonial policing operation.
Ms D’Orsi, who since March 2021 has served as chief constable of the British Transport Police, said the operation concerned the “largest ever deployment of hostile vehicle mitigation” with massive automobile boundaries blocking the entrances to roads in central London reminiscent of The Mall.
“We have sadly in the past seen terrorist attacks which have used the car as a weapon, so it is important to make sure that areas are sealed off so that the public is safe.”