The body of a man recovered in the Blue Mountains yesterday has been confirmed to be that of missing man Gary Tweddle.

The 23-year-old's body was recovered from a cliff face at Leura, west of Sydney, after his disappearance prompted the biggest search ever conducted in the Blue Mountains.

Mr Tweddle, a British-born computer sales representative, was attending a conference at the Fairmont Resort at Leura when he went missing in mid July.

After a night of drinking, he ran out of the resort without his glasses or jacket.

Later that night he spent 17 minutes on the phone to colleagues saying he was lost in the bush, but his phone died and he has not been heard from since.

Yesterday, Superintendent Darryl Jobson said police would examine the area where Mr Tweedle's body was found in an attempt to determine his cause of death.

"It would appear to be misadventure but we're not ruling anything out," he said.