Is this the Silver Studded Blue butterfly - Plebeius argus

I noticed quite a lot of small butterflies whilst I was out on my walk this morning. This little light blue lovely seemed so delicate.

A little bit of research on the British Butterlies site suggests that it is a Silver Studded blue or Plebeius argus and I wonder, if anyone can confirm this for me I would really appreciate it.

I would also be delighted to have a positive identification of the butterfly in the second photograph (is it a Silver Studded Blue as well??)