Unidentified Lycaenid butterfly

Unidentified Lycaenid butterfly

Observation - Unidentified Lycaenid butterfly - UK and Ireland. Description: I believe there are only six butterflies in this family found in Scotland, so it should be possible to identify this quite easily but I cannot. The only other Lycaenid we have in the vicinity is Common Blue, and when I saw this one I was sure it was some

I believe there are only six butterflies in this family found in Scotland, so it should be possible to identify this quite easily but I cannot. The only other Lycaenid we have in the vicinity is Common Blue, and when I saw this one I was sure it was something different - but what? (I am sorry it is such a poor photograph.)