Identify UK Lycaenid?

[Keith Edkins]

Can anybody give a definite identification of the photos at
http://www.gwydir.demon.co.uk/lycaenid.htm

My handbooks aren't really up to to distinguishing a female Silver-studded
Blue (Plebejus argus) from a Brown Argus (Aricia agestis). Or given that
these seem to be somewhat scarce and localised species (not local to
Cambridge anyway), is it really a very brown female Common Blue (Polyommatus
icarus)?

Keith Edkins
Cambidge