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I'd agree it looks very like a Turnip.
I can see where David is coming from with the suggestion this is a Square-spot Rustic but (even allowing for angle) the wings look too narrow and square to me and the level of overlap between the wings is much more like an Agrotis sp.
Overlapping wings are a feature of the whole subfamily Noctuinae, not just Agrotis. That many photos illustrate Xestia without this is simply due to the insects not being properly at rest. I don't see any indication of a claviform stigma which rules out most Agrotis species. What little can be seen of the shape of the obicular stigma and reniform stimga fit Square-spot Rustic.
Thanks, David. it's not the overlap per se that's driven me that way. Certainly most noctuids have the forewings overlapping somewhat at rest. I have seen hundreds, probably thousands, of Xestia at rest and feel there is a noticeable difference in jizz between these SRR and Agrotis species, particularly the Turnip (and Peridroma saucia, Pearly Underwing would fit in the same general category as Turnip). I think the difference probably comes from a combination of the curvature of the costa (straighter in Turnip), the angle between the costa and the dorsum, the apparent degree of overlap at rest and some impression that on SRR the pivot points of the forewings are further apart than on Turnip.
Some of these features are perhaps distorted by the angle of this photo, and I may well be wrong, but it doesn't feel like an SRR.
It just goes to show how tricky even the commonest moths can be from photographs, particularly since wall all rely on jizz. We're not going to agree on this one!
Lat/Lng: 51.5, -3.1
OS grid ref: ST2589