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I was going to ask if you had any additional photos for this beetle, and then I saw you'd added another one separately to iSpot:
So yes this is Tansy Beetle, a very rare species but you're in the right place to see it! There's some additional information here:
Entomologist and biological recorder
Thank you for the helpful information. I was very excited to see this beautiful beetle - there were perhaps 50- 100 beetles on an area of tansy about 4 metres x 2 metres. Cattle graze on the river bank and some plants had been flattened. I hope that there will be enough plants for this colony to survive.
Lat/Lng: 54.02081, -1.21073
OS grid ref: SE518585
On banks of River Ouse, on a patch of Tansy there were many of these wonderful beetles