Great Britain's Martyn Rooney in action during the mens 400m at The Olympic Stadium, London. Martin Rickett/PA Wire

All of Great Britain’s athletes in the 400 metres were knocked out at the semi-final stages.

Both Great British Londoners Martyn Rooney and Conrad Williams were unable to make to progress through the semi-finals of the 400metres event tonight.

Conrad Williams went in the opening semi-final and started strongly.

The Kent AC athlete was in contention after 300m but going into the back straight but missed out with a time of 45.53 seconds.

“I had to attack it, the crowd was so immense, I knew it was tough to go through and I went out to try and win it,” said Williams.

“I wanted to make sure I was up for it, but I probably went out a bit too fast but I had to give it a go.”

Rooney, from Croydon, went in the third semi-final, knowing exactly what he needed to produce, but he was unable to deliver.

He hung on the coattails of the top four in the race, but just when he needed to kick on along the back straight, was unable to match the others as he finished in a time of 45.31 seconds.

After the race, Rooney said: “I just wasn’t good enough, I would like to apologise for people who have put a lot of time and effort into me in the last four years.

“There was an opportunity to win a medal and I didn’t make it count.”

Fellow Brit Nigel Levine also missed out.