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Kenya's Sabastian Sawe becomes first to break two-hour mark in race conditions
Second-placed Yomif Kejelcha also breaks mark
Ethiopia's Tigst Assefa sets women's only record for second successive year
Marcel Hug wins eighth men's wheelchair title and sixth in a row, as Catherine Debrunner defends women's title
Men's wheelchair race
The men's wheelchair race has reached the halfway point.
Swiss great Marcel Hug, who is looking to equal David Weir's haul of eight London Marathon wins, has built a 46-second lead.
Men's elite race
Steve Cram
BBC One commentator
This men's race is one we have been talking about for months.
Men's elite race
And they're off!
Defending champion Sabastian Sawe breaks into a gentle jog as the men's elite race begins.
Behind them a record number - around 59,000 people - set off on their race.
What a sight.
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Image source, Springhill HospiceGood luck to Alex and James who set off on Tuesday running from Rochdale to London finishing off with the London Marathon today! Raising money for Springhill Hospice in Rochdale, so proud of you both xx
Eve Roberts, Manchester
2025 London marathon winner Sebastian Sawe, speaking to BBC Sport: "Not much pressure on me because I run my own race, and it is only the best moment to be here. To be here again and to be a defending champion."
"Being unbeaten in races is something special even in my life because it is just me.
"I am unique."
On setting a new marathon world record: "Yes, I see [myself setting a new world record]. It is only a matter of time."
On setting a sub-two-hour time in an open competition: "I hope and wish it will be me."
Image source, Getty ImagesKenya's Sabastian Sawe wins men's race on debut
Kenya's Sebastian Sawe returns to London this year with the late Kelvin Kiptum's course record in his sights.
Sawe finished 62 seconds slower than Kiptum's London-best of 2:01:25 in winning last year's race, and has a marathon personal best of 2:02:05.
He targeted a world record at the Berlin Marathon last September, passing halfway in 60:16, but his bid was undone by the hot weather and he finished in 2:02:16.
Sawe will again face competition from half marathon world record holder Jacob Kiplimo, who was runner-up in London last year.
Ugandan Kiplimo regained the half-marathon world record by clocking 57:20 in Lisbon in March, having improved his marathon best to 2:02:23 in Chicago last year.
Joined by Ethiopian Deresa Geleta (2:02:38), three of the nine fastest men in history will go head-to-head.
The men's elite race and the thousands behind them get under way in 10 minutes.
It's warm but not too hot down on the start line - good news for those who are starting to gather.
Our friends over at BBC Weather have been speaking to runners about what makes the ideal weather to run the marathon...
What is the best weather for running the London Marathon?
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Image source, Karen WatersGood luck to Saffron Wingad who is running today for Crohn’s & Colitis 🏃♀️ Having already raised over £3,500 for the charity 💜 we are so proud of your strength & determination! 👏
Karen Waters, Sloth
Image source, Getty ImagesAs ever there are loads of celebs running this year's Marathon. They include:
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Image source, Chloe McManus-ThomsonGood luck Auntie Emma who is running to raise money for Zoe's Place Baby Hospice in Coventry where her niece Olive & family are supported! We love you & are so proud of you!
Chloe McManus-Thomson, Leicestershire
Steve Cram
BBC One commentator
Jessica Warner-Judd started as a fantastic junior athlete. She moved up through the distances. Her story looked as if it was coming to an end, but she has found a new way to show us how good she is.
If you'd like to watch uninterrupted coverage of the elite races today then you can do so under the watch & listen tab above.
The men's wheelchair race has just passed the Cutty Sark with Marcel Hug on the front as we'd expect.
Paula Radcliffe
Former women's marathon world record holder on BBC One
A perfect day to run quickly. They have done all the hard work. These women knew in their heads what they wanted to do. It's a perfect temperature for marathon running.
Image source, Getty ImagesLondon Marathon course records:
*Radcliffe's 'mixed' record came with the use of male pace makers.
Elite women's race
Image source, ReutersOff they go down the long and straight opening stretch. This elite women's race splits into three separate groups, each with their own pacemakers, from the very start.
The front group will be aiming to finish in little over two hours and 15 minutes.
The conditions are ideal.
Elite women's race
The elite women's runners are down on the start line and Jess Warner-Judd is having a laugh and a joke with her fellow competitors.
Lovely to see.
Image source, PA MediaElite women's race
Warner-Judd - Marathon is a 'second chance'
One of the British hopes in the elite women's race is Jess Warner-Judd, who is making her London Marathon debut.
The 31-year-old has had a tricky few years after collapsing on the track during the 2024 European Championship, after what turned out to be undiagnosed epilepsy.
There have been twists and turns since but when Warner-Judd took on the New York Marathon, initially planning to never do another afterwards, she surprised even herself.
She placed seventh and crossed the line two seconds behind Olympic champion Sifan Hassan and within five minutes of winner Hellen Obiri.
Now she's going to give London a go and see where it takes her.
Elite women's race
Assefa sets women's-only marathon world record
Ethiopia's Olympic silver medallist Tigst Assefa set a new women-only world record of 2 hours 15 minutes and 50 seconds last year and reckons she's in better form this year.
“My training has gone well, it has been better, even, than my preparation last year, so I think it is possible to beat the record I set last year," she said this week.
“If I am going to try to break the world record again, the pacemaking has to be important.
"I am expecting the time that the pacemakers will set for the half distance will be allowing me to run faster than the record last year."
It means Assefa is the strong favourite to triumph again, particularly in the absence of Sifan Hassan and Peres Jepchirchir.
Kenya's Joyciline Jepkosgei, who Assefa beat by almost three minutes last year, and New York Marathon winner Hellen Obiri could be her closest challengers.
Women's wheelchair race
Ah. Four minutes after the start, Eden Rainbow-Cooper has only just managed to get her marathon under way. We mentioned there was a technical problem on the start line.
The Briton comes into this having won the Boston Marathon last weekend.
Now she's going to have to try and overhaul a massive deficit all on her own.
The delay isn't too long.
Ellie Kildunne and Sir Mo do their bit by sounding the starting buzzer before the men's and women's wheelchair racers head off down the course.
Image source, Reuters