Just possibly Adonis Blue, second photo is very blurred but shows underside pattern to some extent
No interactions present.
I'm going with the AB id unless anyone contests it.
Paul Seligman. Flickr: http://www.flickr.com/photos/paul_seligman_cardiff/collections/721576087...
Lat/Lng: 50.964, -2.0819
OS grid ref: ST943182
Chalky grassland near footpath