76 people will target 73 world records at this year's London Marathon. Among them are:

• Jennifer Ferris, 40, targeting the fastest marathon with a double mastectomy (female) after she was diagnosed with aggressive stage-three breast cancer in 2022
• Cancer survivor Arnie Delstanche, 29, aiming to break his own record for the fastest marathon in a full-body inflatable costume (male), dressed as a T-Rex
• Mark Goulder, 35, running blindfolded while tethered to his guide and close friend Alex, after his younger brother was diagnosed with a rare condition that causes progressive vision loss
• Ben Spencer, 52, aiming to set the fastest marathon in a non-racing wheelchair (male), to challenge perceptions and encourage more wheelchair users to take part in mass participation sport

Steve Cram
BBC One commentator

They are slowing down quite considerably, even the leaders.

The big three in the women's race, Hellen Obiri, Tigst Assefa and Joyciline Jopkosgei, remain together with around half an hour's running to go.

Eilish McColgan, the leading British runner in seventh, is on her own six minutes back. She looks to be hurting a little.

Jess Warfner-Judd is in 10th.

Nisha Patel
BBC Radio London

Image source, Getty Images

With temperatures set to reach up to 20C today, runners might need a bit of a cool down along the route – that’s where Julie and her team of volunteers come in with their refreshing showers.

She tells BBC Radio London: “Everyone is going to be heating up and the weather is beginning to pick up. I’m already hot, could do with a shower myself.

“We’re all going to take turns as it’s fun and a very important part of the volunteering. Keeping everyone refreshed at mile 18 to give them that extra boost.”

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

It will be down to the racing and we might see those times yo-yo. They are just assessing each other at the moment.

Defending champion Sabastian Sawe leads a group of six at the front of the men's race through halfway in a time of 1:00:29.

The world record marathon time is 2:00:35 for the full distance is. The London Marathon course record is 2:01:05.

If you scan social media you may see the wild rumours that Harry Styles is hiding under the Daddy Pig costume today.

Well, Joe Wicks says, "Daddy Pig is Daddy Pig" when asked to clear up the situation.

I'm waiting for some detailed analysis of those shins...

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

This men's race is building, but I do think there is the ability to kick on in the second half of this race.

Got friends, family or colleagues running today? We know you'll want to try and spot them then!

Our Tower Bridge feed has just got under way so you can do just that.

You can find it in the 'watch & listen' tab at the top of this page, or on BBC iPlayer.

You'll also be able to watch a finish-line stream between 12:30 and 17:00 BST.

Speaking of Tower Bridge...

The leaders in the men's race, including Sabastian Sawe and Jacob Kiplimo, have just crossed Tower Bridge.

They remain a touch under world record time.

Baroness Tanni Grey-Thompson
Six-time London Marathon wheelchair champion on BBC One

An incredible race from Catherine Debrunner in terms of being measured and not panicking. She has not done a lot of back-to-back marathons. It is unusual that she has done Boston and then come to London.

It's Catherine Debrunner on the front but Tatyana McFadden is sticking right onto her wheel.

Now Debrunner pushes harder again...

The gaps builds before the final turn.

Image source, Getty Images

Catherine Debrunner and Tatyana McFadden whiz along the Thames and up to the Palace of Westminster still close together as the women's wheelchair race races its conclusion.

Debrunner, as ever, is the big favourite. It's a little bit surprising McFadden has hung on this long.

Can she win it in a sprint?

Baroness Tanni Grey-Thompson
Six-time London Marathon wheelchair champion on BBC One

Image source, Reuters

David Weir raced very smartly for as long as he could. He did well to not get caught from behind. He drove to Switzerland and back to get his chair fixed, which is not ideal preparation.

David Weir sees pretty pleased with himself as he finishes third in the marathon. A pretty good effort at 46.

Luo Xingchuan takes second.

Andrew Cotter
BBC One commentator

Image source, Getty Images

Marcel Hug is untouchable. The silver bullet flies again. He matches David Weir and he is the best.