Last updated at 14:05
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Pictures: London Marathon world record hopefuls

We check out some of the crazy costumes being worn by London Marathon runners hoping to break world records this Sunday - they include a gorilla, a fire extinguisher and two wedding dresses.
Newlyweds Toby and Sophie McCorry are attempting to become the fastest runners wearing wedding dresses! Sophie said: "Fancy dress is bit of a shared love of ours."
London Marathon - Toby and Sophie McCorry
Inside this fire extinguisher costume is Jerome Timbrell - he's aiming to nab the record for fastest marathon as a mascot!
London Marathon - Jerome Timbrell
Susie Hewer is aiming to break her own world record for knitting the longest scarf while running a marathon. Her current record is 162cm, set in 2008.
London Marathon - Susie Hewer
Chef Chris Wheeler will be running the 26-mile course carrying a stock pot. Seven years ago he ran the race while flipping a pancake the whole time!
London Marathon - Chris Wheeler
You might think Bruce Moore is bananas for running in his gorilla suit. He's hoping to do the fastest marathon in an animal costume. He said: "I hope it will raise a few eyebrows, make people smile."
London Marathon - Bruce Moore
Oliver Hamar is dressing up as Napoleon to try for the fastest marathon in full military uniform.
London Marathon - Oliver Hamar
Mark Anslow's training took a knock when he fractured a bone in his leg. He's still running though - and hoping to get the record for fastest marathon on crutches!
London Marathon - Mark Anslow
A gorilla, a fire extinguisher and two wedding dresses - just some of the crazy costumes being worn by London Marathon runners hoping to break world records this Sunday.
London Marathon - runners going for records