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These are very commonly found on goat willow but I have never seen them named to species level on iSpot.
Recently tried hatching some indoors but it is very difficult to keep the willow fresh enough.
Maybe a muslin tent tied over the twig in situ on the tree would be better.
Meantime they remain a mystery species to me.
Thank you for ID, had no idea. Will keep an eye on them.
Lat/Lng: 52.9095, -1.2369
OS grid ref: SK514349