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Three of the world鈥檚 fastest runners will be amongst some of the athletes taking part in the two day event at Crystal Palace 25 & 26 July.

Jamaica's world 100 metre record holder, Usain Bolt will run the 200 meters at what's likely to be the his last race before the Beijing Olympics.

Usain Bolt & Asafa Powell

Bolt, who ran the fastest time in the 200m this year, winning in a national record in 19.67 seconds at the Athens Grand Prix says he is concentrating on the longer sprint and promises "something very special".

"Despite the fact I have been mainly running the 100m this season, I still see the 200m as my best event," Bolt said. "I know I am capable of something very special over the longer distance."

"I can't wait to get out there and show just what I can do over 200m at the Aviva London Grand Prix.

"Crystal Palace is known as a quick track, there will be a truly world-class field and there is always good support for the Jamaican athletes when we run in London. I can't wait."

Powell (right) congratulates Gay

Meanwhile Asafa Powell will challenge the 100 meter world champion America's Tyson Gay.

Powell who鈥檚 fighting an injury is keen to silence his critics and doubters once and for all.

Taking place over two days for the first time in 23 years, the Aviva London Grand Prix will host a spectacular send-off for British athletes as they finalise their Olympic preparations.

Among the British athletes confirmed are Kelly Sotherton, Phillips Idowu, Nicola Sanders and Christine Ohuruogu.