Jamie Laing has started the fourth of five ultra marathons in five days. He's due to finish in Salford tomorrow.

He's started another leg of 30 miles this morning. A heroic feat.

Meanwhile, Radio 1 listeners are trying to raise enough money by 9.30am - over £450k - that Greg James will have to wear a wedding dress while running alongside Jamie, as a very funny forfeit.

So it's a mix of the silly and the inspiring on Radio 1 this morning.

Click the player at the top of this page to listen live.

Yesterday was the biggest test for Jamie (so far). Conquering three ultra marathons in three days felt almost out of his reach.

See the story of how the day unfolded below:

Image source, Comic Relief

Image source, Comic Relief

Image source, Comic Relief

Image source, Comic Relief

Image source, Comic Relief

Image source, Comic Relief

Image source, Comic Relief

We've been checking Jamie's fitness watch at the end of each day, keeping tracking of his average distance, heart rate, ascent and calories burned.

If you're into your running, you'll probably love this...

Image source, BBC / Comic Relief

Image source, BBC / Comic Relief

Image source, BBC / Comic Relief

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For full terms and information on the registered charity, go to bbc.co.uk/jamie.

Image source, BBC / Comic Relief

The most recent appearance was in 2024 when Greg showed up to the funeral of his favourite duck, Longboi, in suitable attire.

We think he'd look even better in wedding attire.

In the spirit of keeping Jamie smiling, Matt Edmondson has decided to enact revenge on Greg James.

On Tuesday, Greg and his listeners helped raise enough donations for Comic Relief, that Matt Edmondson's beloved trusty scooter was crushed - as a forfeit.

Matt's been stewing on this ever since, so he's ordered in some costumes, and he's set listeners a challenge.

If £375k is raised, Radio 1's Nat O'Leary will wear a shellsuit costume and run a leg with Jamie.

If £400k is raised, Dean McCullough will have to wear a Harry Houdini costume - a nod to his I'm A Celeb! moments last year.

If £450k is raised by 9.30am, Greg will have to run alongside Jamie in a full wedding dress. "It has a veil, a garter, and Jamie will remove that garter with his teeth - this is part of the deal."

Greg: "Why is that part of the deal?"

Matt: "It just is."

It's down to the Radio 1 listeners to see who does the undignified running.

Matt Edmondson
Radio 1 presenter

His body is the worst it's been, obviously. It's like trying to move a mannequin, he's stiffened up everywhere.

It felt really cruel this morning because they got him to the gym at the hotel and put him on a cross trainer - so he's done a workout before an ultra marathon.

He is in such a bad way... But mentally this morning, the power of friendship and love really came through. His 'bestie crowd' turned up and it was a beautiful thing. It's changed something in his brain where he's like: 'Maybe I can do this.'

"Are you kidding me?" says Jamie. "That is unbelievable."

A huge thank you to every single individual who's donated towards the challenge.

For more information on how to donate online or via text, go to bbc.co.uk/jamie.

Image source, Comic Relief / BBC

Greg James - The adventure was always going to unfold, but it is it surprising you with how joyful it can get, how devastatingly low you can get?

Jamie - I can’t explain the different emotions. One minute you won’t be able to put one foot forward, all your body will be saying stop. And then you have moments of complete euphoria. Some moments of irritation, moments of sadness. A rollercoaster of emotions at every single point.

Greg - You’re going through all the emotions of life but in one 24-hour period.

Jamie - So overwhelming, I cannot even begin to explain.

Greg - Do you realise that you’ve just done three ultra marathons?

Jamie - Well the problem is we’ve got two more to go… I will do anything not to do this today, but I’ve got to get it done.

Image source, Comic Relief

Good morning and welcome to Day 4 of our Ultra Marathon Man challenge.

Jamie went from complete desolation to total euphoria yesterday, conquering 'hump day' of the challenge.

He's woken up today in fine spirits, even if his body says otherwise. "My ankle is really swollen, my leg is swollen, so we’re just trying to ease in before we run another ultra marathon."

"Yesterday feels like a bit of a blur. I didn’t really know where I was, but listening back is making me emotional in so many ways."

Watch a recap of Day 3 below, including the triumphant moment he arrived at Loughborough uni to meet hundreds of cheering supporters and his wife Sophie Habboo.

Image source, Comic Relief / BBC

Many call Wednesday 'hump day', and this was certainly a day full of hills to climb for Jamie - physically and mentally. But he's completed the third day of his challenge, he's over halfway through with two more ultra marathons to go.

Image source, BBC / COMIC RELIEF

Today got off to a rocky start, with Jamie telling Greg James he wasn't sure he could complete the challenge. Thanks to lots of encouragement from the Radio 1 listeners Jamie managed to get moving on his journey from Market Harborough to Loughborough.

Emotions were running high, with Jamie in lots of pain and a mammoth day ahead of him. After hearing messages from the Radio 1 listeners, particularly one from Mariella who benefitted from the difference Comic Relief can make to people's lives, a teary Jamie powered on to start the day's run.

The first surprise of the day was from two 100% faithfuls - Leanne and Jake. What more could you need when running an ultra marathon than the two winners of The Traitors? Especially when you've got Leanne who was in the actual army. They ran with Jamie for 8 miles, giving him a much needed pep talk along the way.

He eventually made it to the official halfway point in Leicester, but things were looking bleak. An extremely tired Jamie could barely stand and fell to the ground as soon as he got there.

Thankfully, hype-man Matt Edmondson was on hand to offer his support, and motivational messages from the Radio 1 listeners continued to flood in.

Image source, BBC / COMIC RELIEF

Then just when he needed it most, long-time friend Proudlock surprised Jamie and his reaction was priceless. It was a moving moment, and it gave Jamie the boost he needed to keep going with him saying "I think I can do the rest of it, let's go."

Proving yet again the power of friendship to make the impossible possible.

Image source, Getty Images

And then just like that, he'd done it! After an incredibly gruelling day for our ultra marathon man, Jamie reached the finish line in Loughborough, where Vick and Jerry were waiting for him.

For such an emotional day, the biggest tearjerker was hearing Jamie see his wife, Sophie, at the finish line. After seeing Jamie in tears earlier that day, Sophie couldn't wait any longer to come and see him.

Time for some well-earned rest before Jamie attempts to take on the fourth ultra marathon of this incredible challenge.

Jamie Laing
Radio 1's Ultra Marathon Man

"Are you kidding me? That is amazing. Thank you, I just can't tell you how much that means to so many amazing people, what it's going to do to so many amazing projects that Comic Relief look after.

You are just changing people's lives and it's just incredible and it makes me want to go out and do it again tomorrow. Let's go!"

Jamie's niece Issy B: "Hi Uncle Jamie, I hope you're not too sad that your feet are hurting. I lost a tooth today and when the tooth fairy comes I'm going to donate the money to a charity. I love you."

Jamie: *audibly sobbing* "You can't do this anymore guys, I need to keep the liquids in, I'm so dehydrated."

Sophie Habboo
Jamie Laing's wife

I was meant to come on Thursday but obviously I can't speak to you and I was seeing you crying and you called me at one point and you didn't sound OK, and so I got on the next train up here. It's so emotional, I'm so proud of you!

Jamie: Honestly, if I could go in the foetal position right now just by myself that would be lovely, next to a glass of elderflower.

Vick: Can someone get this man a glass of elderflower?

Jamie: And like a scotch egg. That's all I want to do.

Jamie Laing
Radio 1's Ultra Marathon Man

The whole way round I was just listening to my wedding song, Ed Sheeran - 'Perfect' and 'The River Flows in You', which was my first dance and then what Sophie walked down the aisle to. I don't know why but it was the thing that made me keep going and then seeing her, it's amazing.

Jamie Laing
Radio 1's Ultra Marathon Man

As he debriefed on the day with Vick & Jerry, they wanted to know what it was that kept Jamie going. Looking back, he revealed just how close he was to throwing in the towel

Jamie: "There was a point today where we were about halfway, 25 kilometres in, we were in Leicester and I just didn't think I had it. That was it. I was done.

Vick: "Would you have stopped?"

Jamie: "There was part of me that was like 'I don't think I can do this', if my mindset doesn't shift or my pain doesn't go. Everything was just so overwhelming and I just lay down and thought 'God, I'm going to let everyone down'. This is going to be terrible. And I thought this isn't going to work."

Despite the pain and doubt, he's done it, he's completed the third ultra marathon of his challenge. Go Jamie!

Jamie's reached the finish line where Vick and Jerry are waiting for him alongside Proudlock and his wife Sophie, who has surprised him.

According to Vick, when Sophie saw Jamie crying earlier today she couldn't not come to Loughborough today.

Ok, now we're all crying.

We heard the incredible moment Jamie was surprised by one of his closest friends, Ollie Proudlock, earlier - the pictures are even better.