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Seems to lack the yellow face of Mesembrina...something else, I think.
My Flickr photos...
It is not M. meridiana. Discal vein is wrong and no yellow face. If that is really a blackish wing-shade someone should be able to name it.
Hi Ophrys and Mydea. Yes, I see what you mean. I remember that it was larger than the typical Muscid.
Lat/Lng: 51.46, 0.02
OS grid ref: TQ404753