A BBC newsreader and television star has told how she collapsed during the London Marathon

A BBC star has opened up about blacking out and collapsing during a huge sporting event.

Newsreader Sophie Raworth recounted the incident ahead of this year's London Marathon, which she is preparing to tackle again, running for the 13th time on April 26.

Appearing on The One Show, Sophie shared that she had wanted to complete her first go at the 26.2 mile run in under four hours but became dehydrated and collapsed just a couple of miles from the end. She ended up on oxygen and in a medical tent, telling the show's hosts Alex Jones and Roman Kemp: "It was awful."

The star - who didn't begin long distance running until she was 42 - explained that when she first tackled the run in 2011 it was "really hot" and that she "didn't drink enough water".

"And I got to about mile 24, and I blacked out," she said. "I don't actually remember quite what happened, but I did black out.

"And I woke up about 20 minutes later with people putting an oxygen mask on and people pouring ice all over me. And I had a temperature of 42 Celsius, and it was awful, actually. And I had a good two hours with St John Ambulance, who were amazing, and looked after me."

She went on: "And then they said, 'We'll put you on a bus back to the finish.' And I'd raised all this money for charity. I was like, 'I can't come on a bus back to the finish. I have to finish this thing.' So I made them let me walk. So I walked to the finish line, and it was six hours, 22 minutes, and 57 seconds was my first marathon time.

"But what it taught me was that if you fall, if you crash like I did, if you just you can pick yourself up and get back on it again. Because I went back a year later, did the training again, and I came under four hours, which is what I was trying to do that year."

Presenter Alex mentioned that Sophie had shared the medical tent with Kaiser Chiefs' Ricky Wilson.

"Yeah, so that was his first marathon too, and his last, actually, because he also collapsed," said Sophie.

The star didn't know anything about it until she saw the musician discussing it on TV, and heard him mention that she'd been brought into the tent when he was there.

She said: "And then he started saying, 'Oh, yeah. I mean, honestly, I saw things no man should ever see.' And I was out there going, 'Oh, no'."

The star said it took her years to "pluck up the courage" to ask what he'd seen and that when she was writing her new book Running On Air she called to ask. But she teased: "I'm not going to tell you here, now!"

The One Show airs on BBC One from 7pm on weekdays.