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BBC One

Musician Harry Judd has gone live on BBC One whilst running the marathon: "I'm trying to be sensible but it's not easy. I am truing to stay calm and relaxed because it's very hot out here. I'm 13k in and it's going to be a grind today because it's hot."

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Weynay Ghebresilasie is the leading Briton at halfway in the men's race. Mahamed Mahamed, who was fourth last year, was second and Phil Sesemann third.

Ghebresilasie is 14th overall.

Eilish McColgan has got herself up to seventh in the women's race.

Paula Radcliffe
Former women's marathon world record holder on BBC One

The gap continues to grow in the elite women's race.

It doesn't look like a gap that Sifan Hassan can do anything about either.

You would have expected them to slow down a bit. It's phenomenal running going through the first half so quick.

And to be maintaining the tempo and turning that screw is why we can see the Olympic champion hurting the way that she is.

Steve Cram
Athletics commentator on BBC TV

What a day for fancy dress ... not! It's so warm.

Sarah Louise Haddock is running today dressed as a fish. Yes, she is aware of the obvious pun.

"I am going for the Guinness World Record of completing the marathon in the fastest time dressed as a fish for Spinal Research.

"I am in the disability category so I get eight hours to do it."

The elite men have dropped their pace makers and have just crossed the Thames at Tower Bridge.

The lead group, which includes Eliud Kipchoge and Jacob Kiplimo, has reached halfway in 1:01:30.

That's outside of world-record pace but still quick.

The youngest runner this year will be Lucy Jones, who celebrates her 18th birthday today.

"It is not what many people can do on their 18th birthday," she told BBC Radio 5 Live.

Lucy is running in for Macmillan in memory of her mum Clare, who died when she was nine.

"She raised a lot of money when she was alive," Lucy said. "I am proud to be running in her memory for a charity that means so much to us."

Catherine Debrunner finished in one hour 34.18 seconds there, only two seconds outside of her own world record.

That's four minutes quicker than her own course record (1:38:24), however.

Catherine Debrunner was so quick she has finished among the top 10 in the men's race!

She wins with no women in sight. That's Debrunner's third victory in London.

Image source, Getty Images

Back to The Mall.

Catherine Debrunner is closing in...

Emma Middleton
BBC Sport Ask Me Anything

They’re not the elites but ‘pacer’ athletes.

You’ll be able to tell them apart by their distinctive vests with ‘PACE 1’, ‘PACE 2’ etc on their front, rather than their names.

Pacers are there to support the elites hit their target times - whether that be to win the race, or achieve qualifying standards for certain competitions.

Each pacer will be assigned to a ‘pace group’, and will be given instructions on what pace to run at to help their group of athletes hit their times.

Paula Radcliffe
Former women's marathon world record holder on BBC One

Who is the boss here between Assefa and Jepkosegi?

They're trying to get themselves straight on who is going to do the work here from now on.

It's starting to look more and more like it might not be Sifan Hassan's day today.

Tigst Assefa and Joyciline Jepkosgei have dropped their final pace maker as they continue with this brutally fast time.

Hassan is a fair way back down the road. They're beyond halfway in that one and records remain very much possible.

We called it!

Switzerland's Marcel Hug was in a class of his own again today.

He is first over the finish line in front of Buckingham Palace as he wins his fifth men's wheelchair London Marathon win a row and seventh overall.

Image source, Reuters

Paula Radcliffe
Former women's marathon world record holder on BBC 5 Live

Paula was asked how much advice she has given her daughter Isla, who runs today:

A bigger question is how much advice does she want to take. She has been offered a lot.

She has taken more on from Steve and I am hugely grateful to him for stepping in. Like most teenagers she doesn't want to listen to mum and dad that much.

I have no cares how long it takes her to come around. I just want to see her smiling coming up the Mall.

BBC One

Image source, Getty Images

Isla Lough, daughter of Paula Radcliffe, is running her first London Marathon today at just 18-years-old. Here she is above 10 years ago when her mum completed her final London Marathon.

Speaking today on BBC One to Gabby Logan, she said: "I am running it for Children with Cancer UK. Last year I was here and I saw the atmosphere and it really made me want to run it and be part of the atmosphere.

"When I was 13 I was diagnosed with cancer and I have seen it all so I want to be part of the aid.

"Mum said do it next year! She said I needed a year for my studies and that it was a bit too soon, but I wanted to be 18 and be the youngest or child to do it."

On whether she's done enough training, she added: "Not really! I think I am lacking the training but it will be ok."