Prime Minister David Cameron will kick start the remembrance weekend when he addresses a group of Royal Marines outside 10 Downing Street today.
The Conservative leader will hear a rousing rendition of Jerusalem, sung by the chart-topping Military Wives Choir before the teams of Royal Marines head off around the streets of London to break a speed march world record.
The two teams of Royal Marines will raise around £50,000 for the Royal Marines Association as they run a 26.5 mile course in under four hours and 19 minutes.
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In March 1992, Cilla Black became an ITV News reporter for National Trading Places Day to raise money for charity.