[thunder]

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Even gaps as small as 10m may prevent bats using hedgerows and tree lines.
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Note the word "may". Bats certainly do spend time flying over open countryside

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My thought was that big wind-turbines tend to be situated on the tops in upland areas where there are few trees, hedges or ditches, and in very windy places. Such places are not good habitat for many insects and equally not good for bats. So I am suggesting that wind-farms are not a major threat to UK bats, whatever the cause-of-death might be if they did fly into one.
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You had better visit East Anglia, where the wind farms are sited in flat countryside! The truth is, we just do not know how big a threat windfarms are to UK bats, as few (if any) sites are monitored properly, if at all. This work needs to be done urgently.

henrya