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Many thanks Mossnisse for this useful key. Based on it and some other feedback I've had, I think it's most likely to be V. cingulata as the wing pattern is apparently wrong for V. venusta (which has a broader dark stripe on the leading edge of the wing) and the key suggests cingulata is more cleaarly banded (thiugh that's not clear from images...) and I think the much shorter hairs than bristles on the hind tibia suggest cingulata (though i'm not used to using keys...) Also modesta is really a coastal dune species and this is a long way inland on grassland.