Another white flower I don't know the name of

I photographed this in a friend's garden but I forgot to ask her what it's name is. Maybe a blipper will know. 

It is certainly very pretty but I didn't notice the insect life it had attracted until I looked closely at the picture. You may have to press the 'large' button to see them. That way you look at the original file I uploaded and not the normal 'downgraded' version you usually see.