9am: Elite women's race begins
9.20am: The Wheelchair race starts
9.23am: International Paralympic Committee Marathon World Cup race begins.
9.45am: Elite men's race begins
10am: Mass start
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.