This is the last race that Brendan Foster will ever commentate for the BBC. The end of an era.

And you can catch Brendan Foster: A life in Athletics on BBC One at 23:30 BST.

Don't miss it.

Mutaz Barshim has sailed over another bar at 2.35m. He is looking a safe bet for gold.

BBC Radio 5 live

Britain's Lynsey Sharp, who finished eighth in the women's 800m, told BBC Sport:

"Obviously that is the worst result I could have had. I committed from the first lap, I didn't just want to go through the motions. But I just didn't have the legs with 250m to go.

"It's been hard to get to this point, so I'm proud of that."

Image source, Getty Images

Next on track is Britain’s Chris O’Hare. He warmed up for London 2017 by breaking John Robson’s 38-year-old Scottish record and his form during the rounds has suggested he could be in the medal shake-up along with the only survivor from the Rio 2016 podium – bronze medallist Nick Willis of New Zealand.

Reigning European champion Filip Ingebrigtsen, 24,has been tipped to challenge and perhaps deliver another Norwegian celebration following their unexpected 400m hurdles triumph from Karsten Warholm.

To clear that up, gold for Caster Semenya, silver for Francine Niyonsaba and bronze for Ajee Wilson.

Lynsey Sharp was eighth but in a strong time of 1:58.98.

I'd like to know how fast Caster Semenya covered that last 150m in. She full on sprinted it.

That is the 16th best time EVER.

Paula Radcliffe
Women's marathon world record holder on BBC TV

Caster Semenya is unbeatable. She just strode out there - she waited and waited so patiently and struck at the right moment.

Image source, Reuters

Paula Radcliffe
Women's marathon world record holder on BBC TV

Lynsey Sharp is in a good position but the pace has just been wound up.

A first lap of 57.98 seconds. Not slow. Francine Niyonsaba goes to the front, Caster Semenya in about fourth. But that's usual.

Image source, Reuters

Bang! they're off. Ajee Wilson does indeed hit the front straight away. That's the way she goes.

Sensational stuff from Hellen Obiri. See you later!

Lynsey Sharp looks focused, ready for this. She has done well to reach the final and may be targeting a PB here. Her best yet is 1:57.69.

United States are currently on 27 medals in London.

The most medals won at a World Championships?

East Germany in 1987, with 31.

Now. It's since been established that state-sponsored, systematic doping of East German sportsmen and women was administered by the country's secret police, the Stasi, from the late 1970s up to the reunification with West Germany in 1990.

But many of the records and achievements of that era still stand.

It's an interesting subject, and if you wanted to learn more about it, here's a good place to start.

Image source, Getty Images

Lynsey Sharp accelerates through the top bend as she warms up in preparation for this final. Nobody wants to get an injury like Usain. Stay warm.

Caster Semenya looks as serene as ever but keep an eye on American Ajee Wilson. She has been magnificent in qualifying and likes to sprint it from the gun. If she goes out she could be a cat amongst the African pigeons.

Image source, Getty Images

Robbie Grabarz couldn't find his way over the bar at 2.29m. He will go home without a medal.

Daryll Neita: "The atmosphere was even more electric than it was in the heats so we had that little extra pressure but were able to perform under that pressure."

Dina Asher-Smith: "We wanted to come and do our nation and country proud and give the best we can".

Asha Philip: "We have worked hard this year. We have had a few niggles but we know how to put it together when the time comes."

Desiree Henry: "We all went to our first Olympics together and got our first Olympic medals together so we feel like sisters and have really learned to stick together as a family."

Image source, BBC Sport

Who wants to hear from the four British women who sprinted to silver last night?