Actually I do not believe that it is wild native flower even I found it in wild, more precisely in Lower Seymour Conservation Reserve. They are still in bloom
Impatiens species http://www.carolscornwall.com/Plants Lichens and Fungi/Plant-Impatiens glandulifera27-07-09.jpg
It looks like Impatiens glandulifera, the flowers of which are typically pink, fading with age, as in this photo ( http://www.botanicalstockphotos.com/img595.htm ), but there are some very pale forms like this one: http://www.floralimages.co.uk/page.php?taxon=impatiens_glandulifera,1&ad=2.
A very pretty flower... BUT oh dear... this is another extremely invasive pest species here in Britain. It has taken over many miles of river bank and roadside verges. This has resulted in all the native wild flowers that used to be there being smothered. The seed pods are like coiled springs and can shoot the seeds some distance from the parent plant. https://www.google.co.uk/search?q=i...2Fguides%2Fpf%2Fshowimage%2F210970%2F;800;537
I'm sure Nadia means that the ID is good, and is not defending the insidious little plant. Well, she did tell me there were only two little patches.
Exactly, I mean that I looked at images and read about plant and very satisfied with ID as Impatiens glandulifera