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More than 250 Kent police staff were deployed to London following the Queen's death at a cost of £260,000.
Officers from across the country were sent to the capital to assist the Met as thousands of people flocked to pay their respects back in September.
A Freedom of Information request carried out by the Local Democracy Reporting Service revealed 263 officers were sent to London from the county.
They served between Sunday, September 11 and Friday, September 23. The total spend for this was £263,449.
The day of the funeral itself was the Met Police's largest-ever operation, with 67 arrests made.
The Met's Police and Crime Commissioner Sir Mark Rowley previously spoke of how officers were deployed from every force in the country for so-called Operation London Bridge.
He said the policing the capital following the Queen's death involved 10,000 officers and was larger than the operation for the London 2012 Olympics.
Over 10 days, 45,000 hotel rooms were were booked to accommodate officers who had travelled in to help.
Kent Police's Acting Chief Superintendent Simon Alland said: "Mutual aid is routinely used to share officers across the country to make sure policing can meet increased demand.
"Police forces are able to ask other forces for additional officers to support them in response to or in anticipation of a major incident or event.
"Kent Police, has on occasions, provided assistance to support another force via the mutual aid scheme. This includes most recently during the death of Her Majesty The Queen and the COP26 climate change conference in Glasgow.
"The force has also requested the assistance from other forces, for example to support the Kent Resilience Forum during severe traffic delays on the county’s road network.
"When this has happened it does not affect or impact on policing in Kent as the force has plans in place to ensure it can continue its core service to the public, keeping communities safe."