Runners set for London Marathon
Around 35,000 fundraisers, amateur runners and elite athletes will take part in the 35th London Marathon tomorrow.
Forecasters have warned that the 26.2-mile race could be hit by heavy bursts of rain.
Crowds lining the streets of the capital will cheer on w omen's world record holder Paula Radcliffe as she runs in her final competitive marathon.
The 41-year-old will start at the head of the massed ranks rather than with the elite field .
Her marathon world record of 2:15:25, set in London in 2003, is almost three minutes faster than any other woman has ever run.
In the men's race Wilson Kipsang will bid to become the fourth man to win three Virgin Money London Marathon titles.
A Met Office spokesman warned that the event will take place in "some rather unsettled conditions".
He said: "T he 2015 race is likely to be cloudy with outbreaks of rain on and off throughout the 26.2-mile course, and there could be some heavy bursts of rain at times.
"It is very likely to feel quite cool under the cloud and rain, especially for the spectators, and will be particularly noticeable given the change from warm, sunny conditions for many over recent days."
Five politicians will be taking time off from defending their House of Commons seats in the General Election campaign to pound the streets of London.
The four Conservatives are: Edward Timpson, Minister for Children and Families; Alun Cairns, Wales Office minister; Graham Evans and Richard Drax.
Labour is represented by shadow justice minister Dan Jarvis.
A host of celebrities will also tackle the famous course to raise money for charity.
They include Formula One driver Jenson Button, Radio 1 DJ Greg James, TV presenter Jenni Falconer, fashion designer Henry Holland, Made in Chelsea star Oliver Proudlock and US model Christy Turlington Burns.
The oldest entrant is Paul Freedman, 90, from Hornchurch, east London, while the youngest will be Jonny Innes, from Falmouth in Cornwall, who will celebrate his 18th birthday tomorrow.
Guinness has received more than 100 requests from entrants who want to attempt a new world record.
These range from the fastest marathon wearing high heels to the quickest time dressed as a framed painting.
The races start at Blackheath and Greenwich Park from 9am and end on The Mall. Road closures will be in force and there will be delays to some public transport.