Ancylosis oblitella or Saltmarsh Knot-horn has been confirmed as a correct id. The first West Midlands record, it arrived with a range of other possible migrants on the 14th of August at Norchard, Worcs. They included Bordered Straw, Small Mottled Willow, White Point, Rush Veneer, Rusty-dot Pearl, 8 Diamond-backs, 3 Silver Ys, and a Beet moth.
I'll add the species to the atlas
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