Article by Jonathan Leake and Harry Byford The Sunday Times www.timesonline.co.uk 13 December 2009

Civil servants have suppressed warnings that wind turbines can generate noise damaging people's health for several square miles around.

The guidance from consultants indicated that the sound level permitted from spinning blades and gearboxes had been set so high - 43 decibels - that local people could be disturbed whenever the wind blew hard. The noise was also thought likely to disrupt sleep.

The report said the best way to protect locals was to cut the maximum permitted noise to 38 decibels, or 33 decibels if the machines created discernible "beating" noises as they spun.

It has now emerged that officials removed the warnings from the draft report in 2006 by Hayes McKenzie Partnership (HMP), the consultants. The final version made no mention of them.

It means that hundreds of turbines at wind farms in Britain have been allowed to generate much higher levels of noise, sparking protests from people living near them.

Among those affected is Jane Davis, 53, a retired National Health Service manager, who has had to abandon her home because of the noise.

It lies half a mile from the Deeping St Nicholas wind farm in south Lincolnshire whose eight turbines began operating in 2006.

"Our problems started three days after the turbines went up and they've carried on ever since. It's like having helicopters going over the top of you at times - on a bad night it's like three or four helicopters circling around," she said.

"We abandoned our home. We rent a house about five miles away - this is our fourth Christmas out of our own home. We couldn't sleep. It is torture - my GP describes it as torture. Three hours of sleep a night is torture."

Jane and Julian Davis had to abandon their home

The HMP report was commissioned by the business department whose responsibilities for wind power have since been taken over by Ed Miliband's Department of Energy and Climate Change (DECC).

The decision to stick with existing noise limits became official guidance for local authorities ruling on planning applications from wind farm developers.

It has also been used by ministers and officials to support the view that there was no need to revise official wind farm noise guidelines and that erecting turbines near homes posed no threat to people's health and wellbeing.

In 2007 Mike Hulme of the Den Brook Judicial Review Group, a band of residents opposing a wind turbine development close to their houses in Devon, submitted a Freedom of Information request asking to see all draft versions of the study.