Laviai Nielsen has come off the final bend in the lead....

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.Bahrain's Salwa Eid Naser was due to be in this race and gunning for her 13th successive victory over the distance after throwing down a scorching 49.17 seconds in Lausanne a fortnight ago.

But the 21-year-old Diamond League leader is absent from the startlist. Not sure what is going on there exactly.

In her absence, keep your eyes Jamaica's Olympic bronze medallist Shericka Jackson, who clocked a 49.78 lifetime best in Kingston a month ago.

Laviai Nielsen, who finished fourth in the European Championships last summer and clocked a decent of 51.31 in Lausanne, leads the British charge along with Emily Diamond.

Goldie Sayers: "I was struggling beforehand. I was desperate to take it all in but it is hard. It has been a long old process, with the Russian athlete appealing and I have since retired. I actually learned that I would get the medal on the way down the M11 on the way to have coffee with my mum,"

Goldie's mum: "I have waited 11 years for this. I remember after Beijing she came off the track and said I could not have given any more."

A little hold-up in the action, but for the best of reasons.

Goldie Sayers, 36, is being awarded her reallocated bronze medal from Beijing 2008 after the disqualification of Russian Mariya Abakumova, who was snagged in a 2016 re-test.

As Hugh Robertson, chairman of the British Olympic Association, explains the situation, Sayers gives the Russian a thumbs down. Good on her.

And as God Saves the Queen rings out Sayers bottom lips wobbles and the tears well up.

Megan Tapper of Jamaica comes home first in a neat 12.63, ahead of American Nia Ali and Nigeria's Tobi Amusan.

Tiffani McReynolds gets through as the fastest loser, but Britain's Yasmin Miller is well back on 13.51.

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Nigeria's Commonwealth Games champ Tobi Amusan is third fastest in the world this year and it looks to be a straight scrap between her and American Ali Nia.

Britain's Yasmin Miller is in lane one.

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Commanding.

Jamaica's former world champion Danielle Williams wins in a personal best 12.41 as she attempts to boost her world ranking and score a spot in her nation's World Champs team.

It is only one hundredth off the world lead of compatriot Janeek Brown.

Queen Claye is second in 12.80 with Britain's Cindy Ofili sixth and out of contention for the final.

False start. I'm not sure who is to blame for that one...

Wow. Two athletes disqualified.

Both Britain's Alicia Barrett and Puerto Rico's Jasmine Camacho-Quinn are sent packing.

A field of seven settles for a second time.

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Here we go then...

Jamaican's Danielle Williams has clocked the fastest time this year of any woman in this first heat, but should come under pressure from American Queen Claye.

Watch out for Australia's Celeste Mucci in lane eight. The 19-year-old is a heptathlete but also claimed her national hurdles title in April in the absence of Sally Pearson.

Cindy Ofili and Alicia Barrett go for Great Britain.

BBC One

The coverage has just started on BBC One with a heart-quickening opening montage, weaving footage of the moon mission from 50 years ago and today's athletics stars.

Who has the right stuff? Let's find out with 24-carat Olympic legends Jessica Ennis-Hill and Michael Johnson joining Gabby.

Click at the top of this page.

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A right royal duke-out in the sand pit was supposed to get us under way at the London Stadium.

World champion Luvo Manyonga of South Africa was due to be taking on world indoor champion Juan Miguel Echevarría of Cuba

However Echevarría has pulled out. In his absence Jamaica's Tajay Gayle and Greece's Miltiadis Tentoglou are the main rivals to Manyonga.

The first jumps going in right now.

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With most of the Americans resting up ahead of next week's US trials in Des Moines, we are missing some of athletics' biggest names.

But frankly there still are more stars on the startlists than in several minor galaxies.

Over the next couple of days you can catch, deep breath, British sprint queen Dina Asher-Smith, double Olympic champion Shelly-Ann Fraser Pryce, world champion Karsten Warholm, red-hot distance world-record holder Sifan Hassan, British 100m hope Zharnel Hughes, Botswana's man in form Nijel Amos, triple Olympic medallist Andre De Grasse, double European indoor champ Laura Muir.

You get the drift. It is more stacked than Harry Aikines-Aryeetey on the Atkins diet.

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Two days, 15 Diamond League events, tens of thousands of spectators and quite possibly the biggest non-major championship competition of the year.

Welcome to our coverage of the Anniversary Games.