Prince Harry has revealed why his brother Prince William is not taking part in this year's London Marathon.
Speaking to volunteers as he prepared to hand out medals at the finish line, he said his brother was "getting old".
Last year Harry joked on BBC that he was planning to enter the London marathon and that the Duke and Duchess of Cambridge were also taking part.
At the time Clarence House moved swiftly to play down his comments; saying they were obviously made "in jest."
ITV News' Royal Correspondent reflects on running the London Marathon in the shadow of one of Africa's most endangered species.
Tens of thousands of runners turned out for the London Marathon in a show of solidarity to the Boston bomb attack victims.
London Marathon runners will wear black ribbons and observe a 30-second silence to honour the victims of the Boston Marathon bombings.