Libby Clegg, speaking to More4 after winning in 24.44 seconds: "We've made a lot of changes this year and it's great to see they're paying off. I just started to run with Chris (her guide) in February. 

"I can't believe we ran that quick. Chris is an incredible athlete himself, having a guide that's international standard has been a really good move. I'm injury-free, with Rio coming up, I'm really happy."

Allison Curbishley
BBC athletics expert on Radio 5 live

That is the solid confidence that Libby Clegg needs going to Rio. She's running with a new guide too but she really looks impressive. You try and run that time blindfolded. So impressive.

BBC One is starting its programme by looking back on yesterday's action, including the moment that shook the stadium.

Namely Keni Harrison's stunning world record - and the delight on her face when confirmation came.

The story was all the more remarkable as Harrison is recovering from the disappointment of not making the American team for the Olympics.

Former world champion and Commonwealth Games gold medallist Libby Clegg - with a new guide (Chris Clarke) - tears home in 24.44 showing she is getting to grips with her new classification.

Image source, PA

BBC One

Michael Johnson and Gabby Logan are outside on the warm-up track building up to the Diamond League meeting, which starts at 14:17 with Jessica Ennis-Hill, Katarina Johnson-Thompson and Shara Proctor in the long jump.

Poland's Michal Derus wins in 10.85, edging out Brazil's Yohansson Nascimento. Those two will take up the cudgels again at the Paralympics where Nascimento will have the cheers of his countrymen in his sails.

Allison Curbishley
BBC athletics expert on Radio 5 live

Marlou van Rhijn, for a double amputee she's such a balanced sprinter. By about 40m she is powering down. That's a really impressive run from her.

Marlou van Rhijn came flying through from a slow start to win in 12.87 ahead of Great Britain's Sophie Kamlish, who sets a new national record with a time of 13.35.

Kamlish's compatriot Laura Sugar was third.

Image source, Reuters

The Netherlands' Marlou van Rhijn - who did the sprint double at the 2013 and 2015 worlds - is expected to go fast...

Hannah Cockcroft, speaking to More4: "It felt like a really good race but my start was a bit rubbish though, I did a bit of a wheelie, I don't know why... But I'm getting there, we're getting close now, there are 47 days to get it right before Rio. I've always known that my acceleration is my strength but it's useful when I do the 800m as well. I always want to go faster. 

"It's so amazing to come back to London, it brings so much emotion back I nearly started crying in the tunnel. This is a fantastic send-off for Rio."

Baroness Tanni Grey-Thompson
11-time Paralympic champion on BBC Radio 5 live

Hannah Cockcroft, that is a fantastic race from her. She just looked completely in control. There was noone going to be anywhere near her. 

Alex Halko, we probably expected her to be a little bit closer, but Hannah just dominates. She's in a class of her own. I can't see anyone beating her in Rio.

Hannah Cockcroft, hands a blur, wheels gathering momentum faster than anyone else in the field, comes home in 17.61 - more than a second clear of second-placed Kare Adenegan.

Image source, PA

Hannah Cockcroft - Britain's Paralympic and double world champion - is the white-hot favourite.

She is the undisputed world number one in this category and the fastest in the world this year.

Another procession? Let's find out...  

BBC Sport has been given exclusive access with Katarina Johnson-Thompson, the heptathlete from Liverpool who is targeting gold in Rio.

Katarina, or KJT as she is known, goes head to head with Jessica Ennis-Hill in the long jump later today. 

In this programme, the BBC follows KJT as she qualifies for Rio, looks at her training regime as she overcomes career-changing surgery and gets a flavour of what her life is like off the track.

Daivd Weir, on More4: "I'm alright. I'm still in training so I didn't take it down for this race. I knew it would be tough today, I'm pleased with that result because of the last few weeks I've had in training." 

Richard Chiassaro: "It was alright! Dave shouted at me to go at 300m so that's when I knew I had to start moving. It's his territory this distance, not mine. When he shouted me to go, that was it."

Baroness Tanni Grey-Thompson
11-time Paralympic champion on BBC Radio 5 live

That was amazing. Marcel Hug raced a very smart race. He's looking really confident, but the race of the day has to go to Richard Chiassaro. He has made massive jumps in the last year, and he raced smart too. When Marcel went he went with him for second.

David Weir in third, I can't remember the last time he was beaten by a British athlete. That will do so much for Richard's confidence before Rio. 

Baroness Tanni Grey-Thompson
11-time Paralympic champion on BBC Radio 5 live

The chairs are racing so close to each other, they're drafting an inch off the back wheel. Accidents do happen. It looks like Brent Lakatos might have hurt his shoulder.

Well, that has put the cat among the pigeons for Rio.

Marcel Hug wins in 3:19.73, holding off David Weir and Britain's Richard Chiassaro.

Weir comes home third. An important psychological blow ahead of the Paralympics?

Image source, Reuters