More than 5,000 police officers from every force in the UK have turned out to pay their final respects to hero PC Keith Palmer, who was killed in the line of duty during the London terror attack in March.
The largest-ever gathering of British police officers will line the route to Southwark Cathedral, where the officer's funeral service is taking place.
Changing cubicles have been provided for officers who have been advised not to travel to the city wearing their uniforms for “personal safety reasons”.
The advisory has been issued by the Metropolitan Police Federation.
Thousands of people will turn out to pay their respects to the murdered policeman
About 50 members of PC Keith Palmer’s family, including his wife, daughter, parents and siblings, will attend the service.
More than 50,000 members of the public are also expected to turn out to pay their respects to the murdered officer, who was stabbed to death outside Parliament during Khalid Masood’s murderous rampage across Westminster.
Officers from the Metropolitan Police Service and from the wider service will be joined by colleagues from the forces of England and Wales to honour their fallen colleague.
The Armed Forces will be represented at the funeral by a number of serving and former members.
The funeral of PC Keith Palmer – in pictures Mon, April 10, 2017
The funeral of the police officer who lost his life in the Westminster terror attack is scheduled for today at 2pm. His body was transferred to the Palace of Westminster yesterday, where a private memorial service was held for members of his close family
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Police officials and mounted police lead the hearse carrying the coffin of London Metropolitan Police Officer PC Keith Palmer during his funeral parade
They will include an Officer and 21 soldiers from across the Regiment acting as ‘Route Markers’ outside of Southwark Cathedral.
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Two Royal Artillery Association Standard Bearers will attend as well as an Honourable Artillery Company Bugler.
The bugler, Lance Corporal Graham Haynes of the Honourable Artillery Company, is also a serving officer within the Parliamentary and Diplomatic Protection Command.
In addition, there will be a number of serving officers and soldiers from 106 (Y) Regiment Royal Artillery Regimental Headquarters and a small representation of serving officers and soldiers from 266 Battery 104 Regiment Royal Artillery.
Officers changed in specially provided cubicles for 'safety reasons'
The Senior Serving Officer in attendance will be Lieutenant General R E Nugee CVO CBE who is the Honorary Colonel of 106 (Y) RA.
It is also expected that approximately 50 ex-serving Regimental personnel will be in attendance at the Cathedral, including Lt Colonel James Cleverly MP.
PC Palmer's body was brought to the chapel at 2pm on Sunday, with a special escort by the Metropolitan Police, where it was greeted by a guard of honour.
A group of officers wearing white gloves formed two lines to meet the vehicle as the coffin was carried inside.
Uniformed police lined the edge of the square and crowds of people gathered to pay their respects.
The 48-year-old's coffin was granted permission by the Queen to rest in Westminster's Chapel of St Mary Undercroft before his funeral.
It is an honour normally reserved for heads of state and which was bestowed on former prime minister Margaret Thatcher and Labour politician Tony Benn.