I think Wim's butterfly is the Common Blue:-
http://www.xs4all.nl/~kite/digiscopics/ ... uwtje.html
If you want to identify something, the easiest way is to ask your search engine the question you want answering! You don't need to know exactly what the subject is. As Wim is from Holland I just put in "Dutch Butterflies" and got a choice of many sites dealing with them.
As Wim says it seems to be
Polyomattus icarus - The Common Blue which we also get in England. Wim's picture is better than that on the other site.
salden
Just ask your search engine what your countries butterflies are and see if you get the Common Blue too.
DaveW