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Was it near Devils Bit Scabious it looks superfically like one of two species that feed on it Abia candens and A.sercica.
Not sure, although that is mainly because I'm sufficiently poor with plants the only way I would have known there was Devils Bit Scabious around was that it had a sign on it saying what it was.
Will check with the person I was with whether he noted any.
Lat/Lng: 51.5904, -0.427
OS grid ref: TQ090891