identification help

  • I wouldn't say I'm an expert, so add a pinch of salt to anything I say, but I would agree with Tony and say female Common Blue. I see a few Northern Brown Argus every now and again and have not yet seen one with any hint of blue. I think the spots on the forewings tend to fade to nothing in NBAs as opposed to white in your example, although I don't know how relevant that really is.
    You don't say where it is, but the white spots on NBAs are actually regional. Those from North England don't have them anyway and these are the ones I see in North Lancs, however, on a good photo, like yours, you can normally see where the white spots should be (as dark spots if that makes sense). I don't see that on your photo. Scottish NBA's have the white spots.

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    Nige   Flickr