Jessica Ennis was denied a personal best in the 100m hurdles at the Great CityGames in Manchester because only nine of the necessary 10 barriers were laid out by the organisers.

The Team GB heptathlete clocked 12.75 seconds but her time does not stand.

Ennis said: “I am so annoyed. I still had a good competitive race, but I've just not got the result I wanted.”

It's a very unfortunate mistake, we're very unhappy about it” Spokesman Nova International

Ennis was delighted with her performance, but said she “can't believe” the “massive, massive mess-up” with the number of hurdles.

“I knew it was going to be a tough race against some quality athletes and hopefully I can keep it going for a few more months.”

A spokesman for the organisers, Nova International, said: “There has been a technical error and there were nine sets of hurdles out on the course instead of 10.

“We'll conduct a thorough investigation and find out what happened and why and by whom.

“It's a very unfortunate mistake, we're very unhappy about it.”…More at Mix-up denies Ennis a hurdles PB