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This is clearly N. signata.... a decidedly uncommon species. However, the evidence from records over the last 10 years or so show that far from declining... it is actually having a better time of it (thank goodness)
Thanks for the information Stuart. Glad to hear it's on the increase. Hope it turns up at one of my sites.
Thank you both for id. Great to come up with something uncommon in my garden!
Lat/Lng: 50.9998, -2.0768
OS grid ref: ST947222