Ichneumon on Midland Hawthorn.
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I was thinking the genus Ichneumon, so thanks for putting me straight on that. By cryptine, you mean an imitative species?
I should have made it clear that I meant the subfamily Cryptinae, a related, and even more species-rich, group of Ichneumonidae.
Lat/Lng: 51.172596666667, 0.52030833333333
OS grid ref: TQ762445