Sulcicollis is present at Sherwood, looks good for it as colour is green but with a hint of blue, but ideally need to look at male aedeagus which is very distinctive in sulcicollis, the other two about the same size at Sherwood are generally a bit more green (angustulus) or bronze green (laticollis)
Thanks Adrian. The key I was looking at mentions frons/eye shape being useful in females, with eyes closer together on top in sulcicollis. Comparing photos, this looks pretty good to me. It was a beauty, whichever it is!
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