Four years ago Jessica Ennis - as she was then - had a truly unforgettable experience in London. It wasn't quite to be tonight but it's great to see a huge smile still cracked across her face.

Silver, not gold. But she was beaten by a stellar display from a young athlete. 

Steve Cram
BBC athletics commentator on BBC TV

Jess did everything she can. It was a big ask for her to run a personal best. Jess was a couple of seconds off of what was required.

The gold medal she craved was grabbed away in the long jump and javelin and you have to hand it to Thiam.

A brave effort from Jessica Ennis-Hill, who takes a silver medal. She was just beaten by the better athlete over the two days.

Jessica Ennis-Hill has done all she can. She wins the heat...

The gap is not big enough. It looks like a silver for Ennis-Hill...

Jessica Ennis-Hill leads from the front with Nafiddatou Thiam way back. That's 400m and she is a few seconds back. It's not enough for Jess yet...

No point in hanging about, Jessica Ennis-Hill needs to go for broke. She leads from the gun. A lone battle.

Image source, bbc

Andy Jameson
BBC commentator and former British Olympic swimmer

He's got five golds here, it's probably one of his most successful Olympics... probably.

Why does he have to retire? He's brilliant! 

Denise Lewis
Olympic heptathlon gold medallist on BBC TV

Jess is going to have to run the race of her life, a new personal best. It is do-able, and it is in the hands of someone special.

The athletes are out in the blocks. If you're just tuning in here's what must happen for Jessica Ennis-Hill to win gold.

She has to beat Nafissatou Thiam by a shade under 10 seconds. If Thiam can finish close to Ennis-Hill then it's gold for the 21-year-old.

But pressure can do weird things in sport. Let's find out...

Adrian Moorhouse
1988 Olympic 100m breaststroke champion on BBC TV

28 Olympic medals. 23 of them gold. What a career he has had - he is the greatest of all time.

Jessica Ennis-Hill needs to make up around 10 seconds on Nafissatou Thiam to take gold in the 800m. Their PBs are close to 10 seconds apart but their best performances this year saw Thiam clock 2:17.28 and Ennis-Hill 2:11.46.

Close, but a repeat of that would mean gold for Belgium. 

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

With only the 800m left in the women's heptathlon, Belgium's Nafissatou Thiam is in the lead, with Great Britain's Jessica Ennis-Hill, the 2012 champion, in second.

Jess has so much experience and success. She can only focus on the controllables and will not worry about what she can't control. She won't focus on Katarina Johnson-Thompson, she won't focus on Thiam, she won't focus on the clock.

The momentum favours Thiam. If she runs a personal best and comes second that is still a success for her. It is going to be tough, but it is going to be fantastic. It is Thiam's race to lose and her gold medal to lose as she is there in the lead. It is a mental chess game.

So much to take in there.

A massive British record with that silver medal - Adam Peaty's leg almost defied belief. 

Michael Phelps retires from Olympic action with his 23rd gold, 28th Olympic medal. Wow.

Australia take bronze. China disqualified. 

And breath.

Nathan Adrian for USA. Duncan Scott for GB.

America are taking gold. Who's getting the change?

SILVER FOR GB. GOLD FOR PHELPS.

Image source, BBC Sport

In the midst of the swimming Mo Farah is the first GB track and field athlete to receive a third gold medal...

James Guy swimming well, Michael Phelps pushing him hard.

The crowd are vocal to say the least.

Phelps is going to edge it, GB second.

Final leg.

GB straight into second place, Peaty taking massive chunks of time out of Cody Miller of USA.

Britain cross first, above world record! 

Here's Michael Phelps, for the last time.