Orpington athlete Dina Asher-Smith has become the first British woman to break the 11-second barrier in the 100m sprint.

The 19-year-old history student announced her arrival as a world-class force by clocking 10.99 seconds at the Sainsbury's Anniversary Games.

The former Newstead Wood School pupil was a box carrier at London 2012, but her achievement on her return to the Olympic Stadium, while only ranking her 17th in the world this year, marked a watershed moment in British women's sprinting.

It was in the heat where she lowered her own British record by 0.03secs, before having to settle for fourth place in the final in 11.06s, still a time only one other British athlete has bettered.

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Photo: Martin Rickett/PA Wire

Asher-Smith, who in the last two months has run three of the four fastest times ever by a British woman, said: "I'm in the 10 seconds now so I'm absolutely over the moon.

"I felt like I was in good shape, but feeling in good shape and then doing it are two very different things.

"When I crossed the line and saw the time I was beaming. I'm really, really happy. I was like, 'What on earth have I just run'?

"I've still got work to do. In both races there is stuff to work on so hopefully I can go a bit faster."

Holland's Dafne Schippers won the final in a Dutch record 10.92.

Asher-Smith is not certain to run the 100m at the World Championships in Beijing in a month's time.

The 200m is also an option and she has ruled out doubling up.

"The selectors (decide)," she said. "It's their team so they make the selection."