A butterfly with orange rim
(Plebeius argus)
Pattern of black spots and form of wings resemble a bluebutterfly from other photo. Perhaps upper side of wings is blue or lilac too.
According UK Butterflies these two photos maybe a male and a female of one species.
UK Butterflies: The Silver-studded Blue gets its name from the light blue reflective scales found on the underside of most adults and which are quite visible when light reflects off them. As with many other species of blue, the males are blue while the female is a less-conspicuous brown, although this butterfly is highly variable and several named subspecies have females with a certain amount of blue on their forewings. This delightful butterfly is found in close-knit colonies, with individuals rarely flying any distance. Most colonies contain less than a thousand adults. However, a few colonies are huge, with the number of adults measured in tens of thousands, providing an amazing spectacle.