Boots are being polished and buttons are being buffed ahead of today's annual inspection of the Woolwich-based Kings Troop Royal Horse Artillery (KTRHA).
The unit is responsible for firing royal and ceremonial salutes, and took centre stage at the funeral of Baroness Thatcher, bearing her coffin from St Clement Danes to St Pauls Cathedral.
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Kent Police said they believe the driver had been asked to leave the club following an altercation.
Emergency services were called to South Street in Enfield this morning, but the victim was pronounced dead around 30 minutes later.