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Sorry to be so long replying but I was not sent an email to say that I had an answer. I have only seen these moths in the morning. There is a river on the other side of the field but not very near. Last nignt on Springwatch there was an item about insects which feed on stinging nettles and one of these moths was on the nettles but we were not told the name of it. I am going to look at the BBC site now and see if I can get asny answers there. Thanks for your answere.