Paula Radcliffe runs final London Marathon in 2:36.55
Kenya's Eliud Kipchoge wins men's marathon
Ethiopia's Tigist Tufa claims women's event
Josh George denies Paralympic champion David Weir seventh win
The elite men are galloping around the course, justifying their status as the best in the world.
With five of the seven fastest men in history competing, it is perhaps no surprise they've set off at an impressive pace.
They've just gone through 15km and all the usual suspects are in the leading pack - Dennis Kimetto, Wilson Kipsang, Geoffrey Mutai, Emmanuel Mutai...
Image source, BBC SportHow special was the world record Paula Radcliffe achieved in London 12 years ago? Very. No-one has yet got close to the mark she set in 2003. Indeed, only four other women have ever run under two hours and 20 minutes in London.
Image source, BBC SportFirst sight of Paula Radcliffe, who is flanked by a gaggle of men.
They rightly looked thrilled to be running alongside the women's world record holder. Incidentally, the three-time winner has gone through the first 10k in 35.23 minutes, which is a super-sharp time and not bad for a woman with an iffy Achilles and a dodgy left foot.
Sophie Gosling: #GetInspired Mr W running with giant scissors @stockportgs good luck!
Sophie Lessar: Good luck in the @LondonMarathon @tommoberly from baby Joshua born 4 weeks ago today - sleep deprived runner!
Adam Moulder: Cheering on my sister and 7 others near mile 5! And everyone else!! Good luck everybody! #GetInspired
Image source, TwitterIf you've spotted a dinosaur in London, don't be worried because it's probably Ian Bates who is hoping to become a record breaker. If you spot a dinosaur and it isn't Ian Bates you should be worried. Very worried.
If Mr Bates clocks under seven hours today he'll break the world record for the fastest marathon in a three-dimensional dinosaur costume. For those interested, the outfit weighs 38kg (six stone in old money).
Image source, BBC Sport
Image source, PADavid Weir, second last year, has to settle for second again this year. It looked like the six-time Paralympic champion was poised for a seventh title but he simply ran out of juice in the end. The 35-year-old is currently just staring into the middle distance, trying to come to terms with another near miss.
Baroness Tanni Grey-Thompson
11-time Paralympic gold medallist and BBC athletics expert
"I can't believe it. David Weir was in an amazing position and I've never seen Josh George come up like that. It's the best race of Josh George's life."
Image source, PAA tense finale. David Weir comes round the final bend of The Mall leading but is overtaken on the home straight by Joshua George. Agonising for the Briton who was pushing for a record seventh victory.
Organisers say a record number 37,500 people have started today's race. Should they all finish, it would be another record, beating the record 36,705 number of finishers set in 2012. How many have completed the London Marathon since it started? 924,741.
Baroness Tanni Grey-Thompson
11-time Paralympic gold medallist and BBC athletics expert
"For the whole race David Weir has been sitting in second position. The way he sits in the chair, the way he drops his head, he can see who is behind him so if anyone goes then he can immediately cover it."
Image source, BBC SportBBC Radio 2 presenter Chris Evans has managed to keep it a secret that he is running in the London Marathon.
His hopes are straightforward and not too ambitious. "My plan is to get here, get round, get to see my wife and kids, get round, get to the pub and get on the radio tomorrow," he says.
Image source, BBC Sport"Will you marry me? Great. Well, I was thinking we could get hitched while running the London Marathon. Sound ok? Great."
Laura Harvey and her partner Paul Elliott will be saying 'I do' during today's race. Laura, wearing a wedding dress, explains: "We're both running separately to Tower Bridge, then we come off, get to the venue, have a quick change, get married, have a few photos and then run to the end.
"In training we have stopped for an hour then started again so we know what it feels like, but it's going to be slow."
Paul adds: "The run itself is definitely more nerve-wracking. Until we hit Tower Bridge I won't be thinking about getting married. It's all about getting there and being on time. Laura is about 20 minutes quicker than me."
There's a river of humanity making their way over the start line in Blackheath. Heads are bobbing, all are smiling, some are waving. Runners in all shapes and sizes, in an array of colours, makes it a splendid sight.
This year's London Marathon could be the greatest in history, so they say, with defending men's champion Wilson Kipsang and world record holder Dennis Kimetto going head-to-head for the first time.
The elite men are lining up on the start line. Behind them are thousands of runners. They wait...the klaxon rattles the eardrums... and they're off!
Image source, BBC SportThe good news for Britain's David Weir is that he is still in contention in the men's wheelchair race as they reach 30km.
There is no sign of his Swiss rival Marcel Hug in that leading group of seven athletes and his challenge looks at an end.
American Tatyana McFadden is well clear in the women's race and is over a minute clear of Manuela Schaer as she approaches the same mark.
In just under five minutes Paula Radcliffe will embark on her final London Marathon. The world record holder receives a warm welcome as she waves to the crowd before chatting to Gabby Logan. Plenty of 'thank you, Paula' posters being waved, too.
"I don't know how much high-fiving I'll be doing," she says. "Maybe when I get nearer the finish. It's going to be an entirely different experience for me, going with the mass start, and it's going to be something special."
Image source, Getty ImagesFor some, running leg-pounding 26.2 miles in a pair of shorts and t-shirt isn't enough of a challenge. There will be about 100 or so people attempting to break world records today, dressed in all sorts of wacky outfits.
Keep an eye out for Robin Hobson, who is aiming to become the fastest man to run a marathon in a pair of wellington boots. There's also Gemma Kirkham, attempting to break four hours and 30 minutes dressed as the Mona Lisa.
This is something the elite runners will not have to worry about. These are the queues for the toilet. Surely the most important part of any preparation.
He won't be going as fast as normal but Formula 1 driver Jenson Button is relishing another race.
"Running is something I've fallen in love with over the last seven years. I have been doing a lot of triathlons and I'm really competitive," says Button, who is running alongside wife Jessica Michibata and raising money for Cancer Research.
"Every London Marathon is hot, but it's chilly. but it's about enjoying the moment and raising money for charity."
Asked if he would be finishing next to his wife, Button replies "only if I can go backwards to get her". Well, he said he was competitive.
Paula Radcliffe:, external I run because I am a runner. I am a runner because I run. Good luck to everyone today wherever you are running but especially in LONDON x
Jessica Ennis-Hill: , externalGood luck to everyone running London Marathon and raising so much for charity.