Brown Argus or Common Blue?

Brown Argus or Common Blue?

Observation - Brown Argus or Common Blue? - UK and Ireland. Description: Didn't settle for long - unfortunately the only time I managed to get a photo of one, it settled on some rubbish. There were a number of these flying around this lovely patch of grassland - at a petrol station. It appeared to be being looked after for w

Didn't settle for long - unfortunately the only time I managed to get a photo of one, it settled on some rubbish. There were a number of these flying around this lovely patch of grassland - at a petrol station. It appeared to be being looked after for wildlife, as the cowslips had been left to flower. There was a lot of ground ivy flowering too.
Is this a female common blue (or perhaps a brown argus?)