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Yes, a male C. quadrifasciatus. Femora lacking the black band of C. flavipes, frons black and thorax with shimmer stripe above middle leg. Is that Hemp Agrimony that it is on? Creeping Thistle and Common Ragwort are what I have been finding it on, recently.
My Flickr photos...
Yes its on Hemp Agrimony. Thanks also for confirming its a male.
Lat/Lng: 50.854, -0.1176
OS grid ref: TQ325077