Steve Backley
Two-time world javelin silver medallist on BBC TV

KJT is really attacking this but Thiam has it all in front of her. She just needs to keep KJT in sight.

Katarina Johnson-Thompson heads straight to the front.

She comes through the bell about five seconds ahead of Nafi Thiam.

And then she kicks from 300m out...

Steve Cram
Commentator on BBC TV

You have to be smart how you run this. It's not as technical as the 200m but you have to run cleverly.

Image source, bbc

A nervous wave to the camera from KJT as she is announced.

Nafi Thiam does not look much more relaxed mind...

We are off and running.

Steve Backley
Two-time world javelin silver medallist on BBC TV

It's going to be a nail-biter but to beat Thiam by 13 seconds is almost the entire home straight.

Katarina Johnson-Thompson strolls out onto the track with the number two safety-pinned to her vest.

The number one, competition leader, world champion and Olympic gold-winner Nafi Thiam is 92 points clear.

That equates to around 13 and a half seconds.

Can the Briton prompt a huge swing in the points and snatch gold?

Dame Jessica Ennis-Hill
London 2012 Olympic heptathlon champion on BBC TV

The reality is that this is a massive gap for Kat to make up.

But she is going to run her heart out and you just never know.

In her mind she will want to run hard and she will want that gold medal.

She knows she can go faster and burn it out.

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

Katarina will give it everything, I'm convinced of that.

Whether it's enough to beat Thiam is another story.

A reminder of the finals taking place - and the Brits aiming for medals:

• 1822: Women’s high jump final - Morgan Lake
• 1907: Women’s triple jump final -Naomi Ogbeta
• 1920: Heptathlon 800m (final event) - Katarina Johnson-Thompson
• 1925: Women’s javelin final - no Brits
• 1950: Women’s 400m hurdles final -Eilidh Doyle, Meghan Beesley
• 2005: Men’s 400m final -Matthew Hudson-Smith
• 2020: Women’s 800m final -Lynsey Sharp, Shelayna Oskan-Clarke, Adelle Tracey
• 2035: 110m hurdles final - Andrew Pozzi
• 2050: Men’s 1500m final - Chris O’Hare, Jake Wightman, Charlie Grice

Toni Minichiello
Jessica Ennis-Hill's coach on BBC TV

So that's her third-best legal jump of the year and that's a super start for Naomi Ogbeta.

Great Britain's Naomi Ogbeta - with more bounce than Zebedee - leaps out to 13.93m on her first attempt.

That puts her eighth of 12 after one attempt in her major championship debut.

Great Britain's Morgan Lake clears 1.91m at the second attempt.

She is one of nine athletes to make it over that height.

The stakes and the bar are rising.

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

You want to see athletes at their best and the best person win.

Katarina Johnson-Thompson has put the demons away. She doesn't have to win this - the thing is not to get beaten by people who are not of your calibre.

I was a little concerned, coming into today with her in the lead and having had all night to think about the pressure, but she has handled it really well.

It's significant for her - she's sometimes spiralled when things don't go too well.

She will also take from this competition that she has been able to put together two really good heptathlons in competition and established consistency when we've been used to flashes of brilliance followed by disappointment.

We are T-minus two minutes on the start of the 800m that concludes the heptathlon competition.

Will the maths at the finish be hung-parliament levels of complexity?

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

Beth Dobbin was right in it and able to maintain her speed. She ran a good curve, her transition was a little tricky which is where some improvement can come from - as well as in her arm action - but it's a very good improvement for her and she looks like she has potential.

Dame Jessica Ennis-Hill
London 2012 Olympic heptathlon champion on BBC TV

Dina is a championship performer. Last year when she had her injury struggles, we didn't expect her to run the way she did at the World Championships

She is so confident now, as if she can perform after such little training, what can she do after a full winter of training?

Michael Johnson
Four-time Olympic gold medallist athlete on BBC TV

Dina Asher-Smith was up on Bianca Williams so quickly

She is running very, very relaxed for the last 60 or 70 meters of the is race, so we know there is more to come. She isn't even close to reaching full speed.

Dina is in a very confident position.

Toni Minichiello
Jessica Ennis-Hill's coach on BBC TV

Image source, Getty Images

It's been a superb heptathlon to watch and it comes down to this last event.

It will be head to head between KJT and Thiam, but I think Thiam is the class of the field.

Thiam has something she can dig inside herself and we have seen a much tidier performance from Katarina, she's been more consistent.

We do know that Kat has worked hard on her 800m and her coaches think she is capable of two minutes four seconds. Her silver medal is safe so she has that opportunity.

It's all about how Thiam responds. Thiam found something when she beat Jess (Ennis-Hill) in Rio 2016 and she can do it again.

It's not over till it's over.

Image source, BBC Sport

The graphic above suggests not.

Gabby Logan earlier put forward a theory on BBC Two, pointing out the fact that KJT finished 13.5 seconds ahead of Nafi Thiam in the London 2017 finale 800m.

But Thiam had gold wrapped, taped and signed for at that point.

Michael Johnson describes Logan's theory as "a stretch".

So here we are.

Could it, just possibly, be a magnificent seventh event for Katarina Johnson-Thompson?

It would have to be more than magnificent - something closer to jaw-dropping - to wrestle gold out of the grasp of Nafi Thiam.

The Belgian world and Olympic champion has a lead of 192 over Johnson-Thompson going into the final discipline.

That equates to approximately 13 seconds.

KJT's personal best is seven and a half seconds better than Thiam's. But the Briton's PB was set back in 2013 and Thiam is only two seconds worse off on their 2018 efforts.