British sprinters Craig Pickering and Tyrone Edgar will compete at the Beijing Olympics after being selected in the 68-strong team to represent Britain at the Games.

The final squad includes 21 Olympic debutants.

The decision to select Pickering and Edgar comes after Dwain Chambers failed to win his court judgement to run at the Olympics yesterday.

Both sprinters have been waiting since last Saturday's race when Chambers won in the fastest time by a European athlete this year of 10.00 seconds.

Williamson, the European Under-23 champion, was the only athlete announced in the first wave of selections last Monday, the selectors deferring naming the other two until Chambers' High Court appearance.

The 30-year-old former drugs cheat lost his injunction, allowing Pickering and Edgar to be chosen.

"This has been one of the strangest weeks of my life and I don't ever want another one like it," said Edgar, winner of last month's European Cup 100m in Annecy.

"I would have preferred a smoother ride, but it has been like a roller-coaster. But athletics is like that, you get the ups and downs."

The US-based star admitted: "I was really disappointed at the trials, but I remained hopeful throughout the week I would get selected for the individual 100m.

"Now I have a big smile on my face, the Olympics is the biggest sporting event in the world and I'm really excited to be part of it."

Additions to the wider squad include the world junior 1500m gold medallist Stephanie Twell, who has earned her place on merit rather than by inclusion under the criteria of being a potential medallist or podium finisher at the London 2012 Games.

The 18-year-old from Aldershot, who held the qualifier from last year, clinched her slot when running a lifetime best of four minutes 05.83seconds in last night's Paris AF Golden League meeting.

Andrew Lemoncello, who achieved a 3000m personal best at the Stade de France, has also been selected with fellow Scotsman Allan Scott chosen for the 110m hurdles.

Martyn Bernard is added to the high jump squad while Rikki Fifton - always on the borderline for a 200m place - has been added to the 4x100m relay squad with Channel Islander Dale Garland joining the 4x400m quartet.

Montell Douglas, who smashed Kathy Cook's 27-year-old UK 100m record with a time of 11.05sec at Loughborough on Thursday, has been picked for that distance along with Laura Turner.

"We have selected a team based on tough criteria and so it should be," said UK performance director Dave Collins.

The British Olympic Association will submit final squad selections on Sunday.