Switzerland's Manuela Shar is expected to dominate the women's race and she looks comfortable in front of the Netherlands' Nikita Den Boer after one lap.

In the men's race, the athletes are trading places at the front - with Britain's David Weir doing his fair share of the work.

Baroness Tanni Grey-Thompson
Six-time London Marathon wheelchair race winner on BBC TV

Drafting can make a huge difference in wheelchair racing.

Marcel Hug has chosen to take it out quite hard. It really is a sprinter's race today.

The second corner is probably the hardest on the course.

The men's and women's wheelchair racers are on the startline.

American Daniel Romanchuk is not in London to defend his wheelchair title, which may leave the way open for 41-year-old Londoner David Weir to claim a record-extending ninth win in the event.

Weir's compatriot Shelly Woods, a two-time champion, is racing at London for the first time in four years since the birth of her son.

However, Switzerland's Manuela Schar will be hot favourite, having won the past nine major marathons she has entered.

Image source, Getty Images

Pacemaker Mo Farah tells the BBC about his experience helping the British runners achieve times for the Olympics next year:

"I really enjoyed it. It's a different atmosphere but the guys did well," he said,

"Next year is exciting and I am in a good place and enjoying myself.

"It's been a difficult year with plans changing and a lot of races cancelled but I had a run in Brussels back on the track and I'm looking forward to Tokyo 2021.

"It was a shock to see Kipchoge struggle. We expected him to win by miles and see what time he won by, but that's part of sport. Shocks happen. I

"I was looking at the screen thinking 'where is he? is he getting dropped?'"

Mark Wright, reality TV star, is now leading BBC viewers through a workout.

"London Marathon" "In front of Buckingham Palace" "BBC" "Jumping Jacks" "Let's go!"

You get the drift...

Eighth placed finisher and pre-race favourite Eliud Kipchoge: " The last 15km I felt it. I felt well in the start. Absolutely there are more marathons in me and I will come back again."

A very cold Eliud Kipchoge, wearing a big winter coat, tells BBC One about his struggles.

"I am really disappointed," said the world record holder. "I had a problem with my right ear after it blocked and then I really cramped and had problems with my hip.

"It was cold but I don't blame the conditions."

Image source, Reuters

Men's race winner Shura Kitata speaking via an interpreter: "Kenenisa Bekele was helping me for this race and he advised me how to run. I trained for the same course, I am very happy to win the race."

This was some of the reaction as Olympic champion and world record holder Eliud Kipchoge's aura of invincibility crumbled.

Jonny Mellor is the first Briton across the line in a time of 2:10:38. Just behind him Ben Connor sneaks inside the Olympic qualifying time and drops to the tarmac in tears....

Shura Kitata's winning time was 2:05:41, one second ahead of Vincent Kipchumba.

Not rapid, but very dramatic.

Eliud Kipchoge arrives at the finish line in eighth and 2:06:39. A strange sight after his rule of the event in recent years.

Shura Kitata digs out an extra few mph on the home straight to snatch gold. Great finish! Kipchumba second and Lemma third.

Image source, Reuters

Kipchumba v Kitata! Shoulder to shoulder up the Mall!

Mosinet Geremew you're time is up!

The Ethiopian can no longer handle the pace.

He drops back. One of Vincent Kipchumna, Shura Kitata and Sisay Lemma to take it in a sprint!

Image source, PA Media

Shura Kitata at the front now, Vincent Kipchumba and Mosinet Geremew on his shoulder. Sisay Lemma now feeling the pace.

800m or so to go.