Runners from across the south are among the 36000 taking part in the London marathon.
Mo Farah is among the favourites in his first marathon since becoming a double Olympic gold medallist. Running conditions are said to be near perfect, with many mnore thousand spectators lining the 26.2 mile route
Celebrities taking part include former Liverpool and England striker Michael Owen, Game of Thrones actress Natalie Dormer, and Michelin-star chef Michel Roux Jr. Rowers Katherine Grainger and Anna Watkins pushed the famous red button at the start line on Shooters Hill.
James Rose, 29, from Maidstone, will run the London Marathon in aid of Make-A-Wish Foundation UK.
James was inspired to help the charity after hearing about how it helped his wife Amy, who was diagnosed with the rare bone marrow disease aplastic anaemia at the age of 13.
When Amy was 16, Make-A-Wish arranged for her to travel to America where she met the cast of her favourite TV show Friends.
As part of the wish day, Amy and her family also sat in the audience to watch an episode of the show being filmed.
James said: "Amy is now 27, and it still touches her when she talks about her time in hospital and the support that Make-A-Wish gave her and her family."
Charlotte Drinkwater is running the London Marathon for Jigsaw (South East) in memory of her friend who died last year from cancer, leaving behind her husband and nine-year-old boy.
She is undertaking her first marathon to raise much-needed funds for local charity, Jigsaw (South East).
Charlotte, 38, from Caterham was motivated to sign up to the world’s largest annual fundraising event after witnessing her late friend Annette Boyle’s two-year battle with lung cancer.
During her illness, which was diagnosed in November 2011, she sought help and guidance from Jigsaw (South East) which offered support and counselling for her little boy, husband and extended family. They continue to help the family through their grief.
The nephew of a Wiltshire couple living with the daily reality of dementia will run the London Marathon to boost funds for Alzheimer’s Research UK.
Fergus Graham, a former junior GB rower, signed up for the 26.2-mile race across the capital in support of his uncle, Jamie, from Dauntsey, near Chippenham, who was diagnosed with early-onset Alzheimer’s disease at just 59.
The 40-year-old, from Whitchurch, Hampshire, hopes to raise at least £5,000 for the UK’s leading dementia research charity.
A runner is hoping to raise £2,000 from this year's Virgin Money London Marathon as he embarks on a 10-year fundraising effort.
Simon Williamson, 36, from Southampton, has pledged to take on 100 marathons over the next decade.
He will be raising money for a different charity each year and has chosen disability charity Whizz-Kidz to benefit from his first year of fundraising.
Simon has been running one marathon a month since August to raise funds for the charity, which provides wheelchairs and mobility equipment for young people across the UK.
A team of runners are set to raise in excess of £8,000 for Poole Hospital Charity today when they take part in the Virgin London Marathon.
The group taking part in this Sunday’s marathon includes six runners who have gained Poole Hospital Charity golden bond places, along with four others raising money for Poole Hospital Charity who have gained ballot places in the race.
Dan Beck, Georgie Codd, Anna Dominguez, Sam Fry, Kitt Harris, Dave Hatch, Gary Moore, Sarah Pitcher, Helen Prestage and Ian Rayney have all been training hard, and will be lining up along with 35,000 other participants in the prestigious race.
Kerry Mitchell's mum died of breast cancer at just 46, but sadly this wasn't to be the only time it has affected her family.
In 2012 three weeks after her 40th birthday, Kerry, from Sussex, was diagnosed with breast cancer and has undergone treatment. .
Kerry's daughter Max has supported her through the treatment and together they are running the London Marathon for Breakthrough Breast Cancer.
Two years ago Lisa Tobin, 43, was diagnosed with Lymphangioleiomyomatosis (known as LAM), a progressive disease that destroys lung tissue and erodes lung function. There is currently no cure and little effective treatment.
Now her partner Mark Winter, 57, from Maidstone, is taking part in today's London Marathon and hopes to raise £2,000 for the charity LAM Action, that supports women like Lisa and funds vital research into the disease.