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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
Hug wins London Marathon wheelchair race for sixth consecutive year
Switzerland's Marcel Hug is in a class of his own again.
This is his sixth win in a row here and his eighth overall. That equals the overall record held by David Weir.
Men's wheelchair race
Baroness Tanni Grey-Thompson
Six-time London Marathon wheelchair champion on BBC One
Marcel Hug is keeping his elbows high at the moment. He is pretty quick and it is not the fastest course.
Men's wheelchair race
Marcel Hug is closing in on an eighth London Marathon victory. He has been in a class of his own yet again.
He's got about a kilometer to go.
Women's elite race
Steve Cram
BBC One commentator
This impacts a race in a big way. When you go this fast you really don't want to be in that situation where you start looking at each other.
Women's elite race
Paula Radcliffe
Former women's marathon world record holder on BBC One
The pace has to slow down and steady down at some point.
Women's elite race
Blimey. What was on the breakfast menu in London?
Hellen Obiri, Tigst Assefa and Joyciline Jopkosgei are 31 seconds under world record time after an hour in the women's race.
Men's elite race
Steve Cram
BBC One commentator
They are running quick enough for us to talk about a world record, but we have to temper that.
Elite men's race
The front of the men's elite race are seven seconds inside world-record pace after 10km.
There's a long way to go but conditions are perfect and the crowds loud.
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Image source, Steve BroganBest of luck to Kevin and Mark Farrell running for Breakthrough T1D so proud of you boys running in memory of your dad Tony Farrell who died last year. Love the Family xxx
Steve Brogan, Nottingham
We've just seen a shot of Daddy Pig making his way over the start line.
A sentence I didn't think I'd write when I sat down at journalism school...
Oliver Whitfield-Miocic
BBC South East
As expected, London is extremely busy today as supporters gather for the 50,00-plus runners.
BBC News South East Correspondent Oliver Whitfield-Miocic reports the trains are "heaving" as supporters make their routes through the capital.
Paula Radcliffe is commentating today. It's 23 years since she broke the marathon world record while running on these very streets...
The marathon world record that stood for 16 years
Joe Wicks
TV Presenter and Fitness Guru on BBC One
We are going to do this together [with Daddy Pig] and cross the line together. This is a special day and this is about Daddy Pig. We are going to do some running, walking and a few selfies.
Exclusive of the year? Gabby Logan interviews Daddy Pig
They say the London Marathon is for everyone and this year none other than Daddy Pig is running the race.
Fans of Peppa Pig will know this has been a storyline on the show over recent weeks with Daddy Pig running the Marathon after it was revealed his son, George Pig, is moderately deaf.
Well not only has Daddy Pig covered the 26.2 miles in the show last week, he is also running it today - costume and all - go raise money and awareness for the National Deaf Children’s Society.
Women's elite race
Is something bubbling up here?
Hellen Obiri, Tigst Assefa and Joyciline Jopkosgei have gone through the 10km mark in 31 minutes.
After all of the talk of records beforehand, that is rapid.
Women's wheelchair race
Unlike Marcel Hug's charge, there is a race on at the front of the women's wheelchair race.
Catherine Debrunner has American Tatyana McFadden for company at halfway.
Steve Cram
BBC One commentator
Alex Yee is going to have the job of looking after the British men in particular. They are going for a fairly ambitious time, and it would be a PB if they sit in that 2:06-2:05 zone.
Men's elite race
We've just had our first shot of Olympic triathlon champion Alex Yee.
He's not running the race today but is instead working as a pace maker for the British group in today's field.
You'll remember Yee finished 14th last year after making the switch for his marathon debut.
Image source, Getty ImagesMen's elite race
Paula Radcliffe
Former women's marathon world record holder on BBC One
The field which has been put together is awesome. Here, I think it is in their best interest to run as fast as possible. We could be on for something very special here today.