Wind Turbines and Minimum Distances from Residential Properties

A Bill is currently before the House of Lords, which is intended will establish minimum distances between wind turbines and residential properties, depending on the size of the turbines. If enacted, local planning authorities will be prohibited to construct wind turbines unless it meets the minimum distance requirements set out. These will be:
If the height of the turbine is greater than 25 metres but less than 50 m there will be a minimum distance requirement of 1000 metres; if greater than 50 m but less than 100 m the minimum distance requirement is 1500 m; if greater than 100 m but does not exceed 150 m there will be a minimum distance of 2000 m; if greater than 150 m the minimum distance will be 2000 metres.

All height measurements are to end of the blade tip at its highest point.

Not too sure what evidence has been placed before the House of Lords - there doesn't appear to be any scientific studies that would help justify the distances and I wonder whether as technology improves, will the quieter turbines result in changes to legislation?