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I must be honest, as soon as I posted I wondered was it Lunar Yellow Underwing! I am not sure enough it is to add another ID to try to correct myself so I'll leave it to others or yourself to agree or correct me.
What size was it?
I think the ID was ok, for some reason those slate grey kidney marks made me wonder but they seems to be on plenty of N. pronuba.
Lat/Lng: 54.07768, -0.84853
OS grid ref: SE754652