I assume its a Spintharina, and probably S. vagans (Radoszkowski, 1887), but I have very little experience with them, Paolo should be able to tell you more
Pictures taken on 25/08/2015. I haven't a clue, mayby a Hedychrydium or Hedychrum spec.? Pics are not that good though see here for the exact location and date: http://observado.org/waarneming/view/105746082?_popup=1 Seen on Rock Samphire (Crithmum maritimum).