The race begins with 51,000 competitors setting off in Blackheath and Greenwich.
The elite women runners start things off at 09.00 followed by the wheelchair race for men & women at 09.20.
In 2009 Samuel Wanjiru of Kenya set the fastest ever time of 2:05:10
The fastest woman was Paula Radcliffe of Great Britain who set a time of 2:15:25 in 2003
Jerzy Kolodziej, age 86, and Irene Clarke, age 83, are the oldest competitors this year
The youngest are James Bruton and Ed Hall, both 18 on race day
There are 81 pubs along the route
10 Guinness World Records were set in 2009, including Sally Orange who was the fastest runner dressed as a fruit (4:32:28)
The tallest costume worn while running a marathon is 4.27m or 14ft
At 09.45 it's the elite men's race, UKA/England Athletics Championships and all other participants.
The race finishes at the Mall between Green Park and St James's Park.
The London Marathon holds the Guinness world record as the largest single annual fundraising event in the world. Last year £47.2 million was raised for charity.
This year will be the first race under new sponsors Virgin which hopes the runners will raise £250 million money for good causes during its five-year sponsorship of the event.
Sir Richard Branson said: "It's an epic and inspirational event and raises a fantastic amount of money for great causes. It's the single biggest fundraising day on the planet and we want to make it even bigger."
Where to watch
A pub in Narrow Street along the marathon route.
More than half a million spectators will watch the big race on 25 April and whether you're supporting someone or just there for the atmosphere it pays to have a strategy to catch the best piece of the action.
Much of the route comes alive to the sounds of bands, cheering crowds and pounding feet so check out our guide.
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