A whole host of evidence was unearthed by detectives at the site in Biss BottomWILLIAMS VERDICT: STRESS and mind games laced the 10 hours of interviews two Wiltshire detectives carried out with Randle Williams.

Det Con Alan Hardman and Det Con Emma Powell were tasked with breaking-down the businessman's wall of arrogance and exposing his lies.

DC Hardman said the stress was, at times, palpable as they grilled the 43-year-old in 22 separate interviews.

"We were more stressed out than Randle Williams," he said.

"It was totally draining. We used to come in and ask if each other got any sleep at all.

"He liked to give the impression that he was better than you and knew more. If you talked about his finances he was in a world of his own.

"People kept saying to me how could you keep your patience? He sobbed several times but we felt it was for his own sympathy it was all crocodile tears.

"He never once lost his temper."

A former scene of crime officer with the RAF police in Germany, dealing with IRA bombings, DC Hardman was also the first to discover the crime scene leading to the discovery of Natalie's waterlogged body.

Spotting cigarette butts, disturbed lilly pads and slip marks on the banks of the River Avon, he raised the alarm.

"I said to the other officer I was with 'I have got a feeling this is the crime scene, this is it'." he said.

DC Hardman, who joined the Wiltshire force in 1992, said interviewing a murderer like Williams was the greatest challenge for a detective.

"The main kudos for a CID officer is to interview a murderer. There is no worse offence."