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Seen today at RSPB Rainham Marshes.
It looks like the Large Ranunculus Polymixis flavicincta. Another photo on this page.
My vote is for small ranunculus, Hecatera dysodea.
For boths species, this is not the normal flight period (July-October ecclectically), but they have been recorded out of season.
Both species are somewhat variable, but the large ranunculus, Polymixis flavicinta, has more diffuse markings than your specimen. Yours has the distinct lunules of H. dysodea.
Apart from being known for its rapid spread, I don't know how common it is now.
I refer to:
Small ranunculus Hecatera dysodea:
- http://www.yorkshiremoths.info/portal/p/Summary/s/Hecatera+dysodea (incl. photo at the end)
Large ranunculus, Polymixis flavicincta:
- http://www.yorkshiremoths.info/portal/p/Summary/s/Polymixis+flavicincta (incl. photo at the end)