A Rare Common Blue

I often see blue butterflies in my garden but they are always the Holly Blue. This is the only exception I am aware of. The orange markings on the hind wing eliminates the Holly Blue. I am far from expert in identifying Blue butterflies but I think this is the common Blue Polyommatus icarus.

EM-1 (manual mode) Kiron 105mm f16 , twin tTL flash, hand-held.

Harold