you could be hearing a snipe, there are loads up here over the summer and i hear them every night, they'll be around here soon i expect. it took me 3 years to find out what it was making a strange noise, they make the noise with their wings. someone better qualified than i should be able to give you a good description of their 'whirring' sound.... to me it's almost like a child spinning a long piece of hosepipe
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