I'm almost certain this is an Adonis Blue but it has a "extra" spot(see pics. below), prominent on it's right side but very faint on it's left side.
There were 2 blues flying so they could be different butterflies
![Confused :?](./images/smilies/icon_confused.gif)
One of my books says that the fw uns may have one or two cell-spots?
Could anyone confirm ID please.
Russ