21:45 BST - Thanks for joining us on a night where GB's Matthew Hudson-Smith smashed a 36-year record to reach the final of the men's 400m, as Cindy Sember, Max Burgin, Daniel Rowden and Ben Pattison all progressed through to the semi-finals of their respective heats.
And there's more to come from the British team tomorrow on a crucial day in the championships, with Keely Hodgkinson, Dina Asher-Smith and Zharnel Hughes all in action in the morning before Molly Caudery competes in the final of the women's pole vault and both Neil Gourley and Josh Kerr look to win the men's 1,500m final in the last event of the day.
All the action starts from 9am - join us again then!
21:21 BST - GB's Laura Muir, Katie Snowden and Melissa Courtney-Bryant have been speaking of their pride at competing in a world championship final.
"I felt like I won before coming into this race because I am happy," Laura Muir said. "It has been hard but I can’t thank the number of people that have supported me - it has been amazing. These two (Katie and Melissa) have done great, I am so proud of them.
"We were the only nation to have three in the final. I am proud of that performance. I gave everything I could today and that is all I could ask of myself. I ran 3:56 in the semi-final - it has been hard but I am really excited for the future."
Katie Snowden added: "It wasn’t actually as quick as I thought it was going to be. I think the semis took quite a lot out of me. From the first lap I felt quite heavy legged I set a big PB in the last round and now eighth in the world - I can’t complain that much."
Melissa Courtney-Bryant said: "I have to be really happy that I am in a World Championship final. The strength in British distance running, and in that final, is incredible. That was a really below-par performance from me so I feel really disappointed.
"I don’t really know what’s wrong, I don’t really have any excuses, I just felt rubbish today."
21:16 BST - Matthew Hudson-Smith set a new European record on his way to reaching Thursday's 400m final and told reporters he worked "too damned hard to not get there".
"I will be happy when I get that medal," he said. "As for today (setting a new record), that is just job done. Coach told me to execute 300 and make sure the job was done, then when I knew I was clear, I was saving something for the final, and I did that. I just need to get that medal now."
21:15 BST - Jessie Knight has been speaking after failing to qualify for the 400m hurdles semi-finals (see 19:38).
"I’m not going to lie I am gutted," she said. "But it’s better than some of the more recent championships that I have done. I really feel like I was in the shape to make that final so it’s a tough one to take but it just wasn’t good enough today."
"I mucked up the last hurdle which will probably haunt me a bit. I am struggling over the first half of the race and leaving myself too much to do at the end."
20:54 BST - It's joy for Morocco's Soufiane El Bakkali who wins the men's steeplechase to claim his third world title in a row! Ethiopia's Lamecha Girma crossed the line to take silver with Kenya's Abraham Kibiwot winning bronze.
El Bakkali, gold medallist at the Tokyo Olympics, will be the clear favourite to win in Paris next year.
Gold: Soufiane El Bakkali (MAR), 8:03.53
Silver: Lamecha Girma (ETH), 8:05.44
Bronze: Abraham Kibiwot (KEN), 8:11.98
20:45 BST - The men's 5,000m steeplechase final has just got underway, while in the high jump, Mutaz Barshim is out after failing at his three attempts to go beyond 2.33m.
It's now a battle between Gianmarco Tamberi and USA's JuVaughn Harrison for gold. Both are neck-and-neck with a world leading jump of 2.36m...
But Harrison fails to clear 2.36m and Tamberi is world champion for the first time! The Italian rips off his shirt and celebrates wildly!
Gold: Gianmarco Tamberi (ITA), 2.36m
Silver: JuVaughn Harrison (USA), 2.36m
Bronze: Mutaz Barshim (QAT), 2.33m
20:38 BST - Faith Kipyegon win the 1,500m! She's a triple world champion!
Ethiopia's Diribe Welteji wins silver on 3:55.69 with Sifan Hassan claiming the bronze (3:56.00).
It's world championship hearbreak for Laura Muir who faded away at the bell to take sixth (3:58.58). Katie Snowden crossed over in eighth (3:59.65) with Melissa Courtney-Bryant running 4:03.31, enough for 12th.
Ireland's Ciara Mageean broke a national record but agonisingly finished outside the medals in fourth, 0.61 seconds behind Hassan.
20:30 BST - The wait is over! Britain's Laura Muir, Katie Snowden and Melissa Courtney-Bryant are about to go for gold in the women’s 1,500m final.
Faith KipyegonSifan HassanWe’re seconds away from starting...
20:26 BST - Laulauga Tausaga has just won gold for the USA in the discus throw. Her 69.49m - a new personal best - beat teammate Valarie Allman who took silver on 69.23m. China's Bin Feng clinched bronze (68.20m) with her very last throw.
Tausaga - who was 12th before her final throw - is a world champion for the first time!
Gold: Laulauga Tausaga (USA), 69.49m PB
Silver: Valarie Allman (USA), 69.23m
Bronze: Bin Feng (CHN), 68.20m
20:17 BST - Agony for Steven Gardiner and Botswana's Bayapo Ndori who crash out of their 400m semi-final and are treated by medics.
Hudson-Smith will be looking on with keen interest that Gardiner - the current Olympic champion and his key challenger to the world title - as well as Ndori - bronze medallist in Tokyo 2020 - will not be in Thursday's final.
20:10 BST - Matthew Hudson-Smith coasts into the lead and crosses the line first on 44.26 - a new European record - to reach the final! What an incredible run. He made it look so easy.
It's been a great night for GB so far and it could get even better. The women's 1,500m is coming up shortly.
19:54 BST - The men's 400m semi-final is about to get underway and British hopes will rest on Matthew Hudson-Smith in heat two. The three-time European champion is looking to better his bronze medal from the world championships last year.
To qualify, he will need to finish in the top two or be among the two fastest runners-up.
19:49 BST - A huge roar erupts in the stadium as Gianmarco Tamberi clears 2.29m in the men's high jump at the first attempt to equal Mutaz Barshim. The bar is raised to 2.33m...
19:38 BST - Disappointment for Jessie Knight who fails to make it through to the semi-finals of the 800m relay, with her time of 54.51 beaten in the very next heat.
Jamaica's Janieve Russell (53.69) and Italy's Ayomide Folorunso - who set a national record on 53.89 - progress as the fastest runners-up in her place.
19:33 BST - Britain's three 800m semi-finalists - Max Burgin, Daniel Rowden and Ben Pattison - have been giving reaction to qualifying from their respective heats.
"It feels like a long time coming," said Burgin. "It has been frustrating missing all these major Championships over the last couple of years, so it feels great that I have finally made it.
"I am in good shape, and hopefully I will have more to give in the next round. I felt as good as I did in London (Diamond League) today, so it is a good sign."
Rowden said: "It was very messy and I am very fortunate to get through. I’m a lot better than that, but that was my fault. Bad positioning… bad tactically.. but by God’s grace I am through to the next round.
"You can’t make any mistakes. I had a plan going into it but I think I stuck to it a little too rigidly - rather than adapting - and I was fortunate I had the strength to come through to the finish. My change of pace was good when I needed it though."
Pattison said: "As per usual I made it look a bit messy, but in my head it was never in doubt. I always knew I would get through which is weird if you watch the race because I was back in sixth at one point.
"I’ve done that so many times now that I have got the experience to know if I get out and into space, I can beat anyone in the last 100m and I backed myself to do that."
19:27 BST - Knight is on the verge of being eliminated. Both Clayton (53.30) and Cockrell (53.63) set personal bests to qualify as Knight finishes 0.03 seconds behind Finland's Viivi Lehikoinen in fourth.
The top two go through automatically along with the two fastest runners-up.
It's unlikely Knight's time of 54.51 will be enough with two semi-finals to go, but let's see.
19:23 BST - On the track, GB's Jessie Knight lines-up in the 400m hurdles. It's expected to be a fast time as she competes against Jamaica's Rushell Clayton - who won bronze at the world’s in 2019 - and USA's Anna Cockrell.
And off they go...
19:20 BST - The women's discus throw is about to start. Meanwhile in the high jump, Gianmarco Tamberi has just failed his first attempt at 2.25 moments after his rival Mutaz Barshim failed to clear the same height.
18:53 BST - Pattison ensures all three British men go through to the 800m semi-finals with a stunning run! The 21-year-old looked beaten with 400m to go but surged in the final straight - timing his run to perfection, overtaking the defending champion Emmanuel Kipkurui Korir (KEN) - to finish second and clock 1:45.67.
Korir, the Olympic gold medallist, finishes fourth and is out!
Ireland's Mark English had a nervous wait through five heats after finishing in 1:45.71, but he goes through as the second fastest runner-up.
18:46 BST - Daniel Rowden joins Burgin in the semi-finals of the 800m - but it was close! He found himself trapped on the inside lane with 100m to go but managed to come third on 1:45.67, just +0.09 ahead of Poland's Filip Ostrowski.
The Olympic silver medallist Ferguson Cheruiyot Rotich (KEN) finishes sixth, and is out!
18:44 BST - The men's high jump final is about to begin and all eyes are on Qatar’s three-time world champion Mutaz Barshim and Italy’s double European champion Gianmarco Tamberi - could we have a repeat of their infamous Tokyo 2020 exploits where they agreed to share the gold medal, or will one of them find a way to out-jump the other?
18:30 BST - No problem for Max Burgin who qualifies for the semi-final after leading from the start. The 21-year-old eased off as he approached the line knowing qualification was secure, crossing over second with a time of 1:45.43.
18:22 BST - Cindy Sember has spoken of her joy at reaching the semi-finals of the women's 100m hurdles.
"The goal is always to qualify and you know I did that," she said. "I had a bit of nerves and I’ve had some niggles this year so I am just happy to make it and I am looking forward to the semi.
"It’s been a little bit of a late start to the year, and so I was a little bit behind, but now I have that confidence knowing I can still hurdle, now I know I can really take it into the semi-final."
18:20 BST - We move on to the heats for the men’s 800m and hopes are high for GB trio Max Burgin, Daniel Rowden and Ben Pattison to reach Thursday’s semi-finals.
Burgin, last year’s national champion, won the Diamond League meeting in London last month and clocked his personal best 1:43.85 this season. Rowden will face stiff competition from Kenya’s Olympic silver medallist Ferguson Cheruiyot Rotich, but has still managed the third fastest time in his heat. Pattison won bronze in the Commonwealth Games last year and runs in the fifth of seven heats.
The first three qualify automatically for Thursday's semi-final, along with the fastest three runners-up.
17:57 BST - GB's Cindy Sember qualifies for Wednesday’s 100m hurdles semi-final - in a blisteringly fast heat.
The 29-year-old put in a season's best run of 12.83 to qualify fourth, with heat winner Kendra Harrison (USA) clocking 12.24 - a world-leading time. Bahama’s Devynne Charlton set a new national record to finish second on 12.44. Danielle Williams (JAM) also had to put in a season's best (12.51) to complete the top four.
17:35 BST - The heats for the women's 100m hurdles are about to get underway. The athletes are ready, the crowd are cheering, the music is pumping - let's start!
17:08 BST - Ahead of the action tonight, we've just seen Sha'Carri Richardson awarded the gold medal for her incredible win in the 100m last night, alongside Shericka Jackson and Shelly-Ann Fraser-Pryce, who took silver and bronze respectively.
How will Dina Asher-Smith and Daryll Neita respond to the trio in the 200m? The heats get underway tomorrow morning.
16:30 BST - We're just over an hour away from the opening event of the evening - the heats for the women's 100m hurdles.
Briton’s national record-holder Cindy Sember runs in heat three alongside Tokyo 2020 silver medallist Kendra Harrison (USA), who will be favourite to qualify first as she looks to improve on her silver at the world's in 2019.
The top four in each heat will qualify automatically for the semi-finals, as well as the top four fastest runners-up, meaning Sember will most likely need to improve on her season's best 12.87 to be in contention to reach the latter stages.
This year she is currently seventh fastest from the nine runners competing in her heat.
12:33 BST - But first, some breaking news. It's getting very hot in Budapest, so much in fact that Wednesday's heats for the women's 5,000m - featuring Britain's Megan Keith - originally scheduled for 11am, will now take place at 7pm.
As a consequence, heats for the women's 200m (including new 100m champion Sha'Carri Richardson and British stars Daryll Neita, Bianca Williams and Dina Asher-Smith) will now start at an earlier time of 11.20am, with heats for the men's 200m (involving GB's Zharnel Hughes and 100m gold medallist Noah Lyles) getting underway from 12.15pm.
"The weather conditions in Budapest are becoming extreme," a statement from World Athletics said. "Current predications are that the 5,000m will be run under black flag code. This is not an acceptable level for our athletes."
12:30 BST - Welcome along to the fourth day of the World Athletics Championships in Budapest!
After the thrilling finale to yesterday's action with Sha'Carri Richardson winning her first world title in the 100m, we move on to the middle distance and whether the British trio Melissa Courtney-Bryant, Laura Muir and Katie Snowden can medal in the 1,500m.
Before then, GB's Max Burgin, Daniel Rowden and Ben Pattison compete in the heats for the men's 800m, Jessie Knight will look to reach the final of the women's 400m hurdles as Matthew Hudson-Smith takes his place in the men's 400m semi-final.
All the action will get underway from 5.40pm starting with the heats in the women's 100m hurdles, featuring British hopeful Cindy Sember. There's also the final of the high jump, discus throw and the 3,000m steeplechase before the end of the evening.
Strap yourselves in!
Relive all the action from the World Athletics Championships 2023 in Budapest
Day 1: GB win first medal, Hughes breezes through 100m heat
Day 2: Hughes wins men's 100m bronze, Johnson-Thompson storms to gold
Day 3: Sha'Carri Richardson wins 100m final to seal maiden world title
