The chief constable said it had been his officers’ ‘honour’ to serve the Queen.
John Campbell’s officers will take part in one of the biggest operations in Thames Valley Police’s history when The Queen’s funeral procession is expected to take to the streets of Windsor.
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The senior officer, who was awarded the Queen’s Policing Medal in the 2015 birthday honours list, said: “It is with great sorrow that we have learned this evening of the death of HM The Queen.
“The Queen has ruled for longer than any other Monarch in British history and Thames Valley Police has had the privilege of protecting The Queen whilst in residence at Windsor Castle.
“Moreover, the Force has a long and proud history of policing Royal events from the annual Windsor Garter Ceremony, The Queen’s 90th birthday, Jubilee celebrations, and the funeral of HRH Prince Philip.”
He added: “On behalf of the whole of Thames Valley Police, I offer our deepest condolences to all of the Royal Family and members of the Royal Household.
“It has been the Force’s honour to serve Her Majesty.”