Unidentified "blue" butterfly Brown Argus?

Unidentified

Observation - Unidentified "blue" butterfly Brown Argus? - UK and Ireland. Description: I saw this butterfly of the blue family today at Malling Down; a managed chalk downland site. I also saw common blue, chalkhill blue, brown argus and adonis blue but the underwing markings and stripey body have me confused. Can any of the wonderful iSpo

I saw this butterfly of the "blue" family today at Malling Down; a managed chalk downland site. I also saw common blue, chalkhill blue, brown argus and adonis blue but the underwing markings and stripey body have me confused. The figure of 8 marking makes me think a brown argus but the stripey body is a feature I've not seen on them before. Can any of the wonderful iSpot experts tell me what I saw? Many thanks in advance.