Found the nest with many asps entering and leaving on 21 April, treated it on the night of the 24 April with Bayer Wasp and Ant powder, and checked the next day and today, 28 April, and there's no activity. There's some good information about controlling them on the Facebook page: European Wasp Control Project https://www.facebook.com/groups/927515897312332
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2,166,933 sightings of 20,573 species in 6,800 locations from 11,955 contributors
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