Posted: 28/04/2014 at 08:33
Your first picture looks a bit like an English native, but I think that the flowers don't all come from one side of the stem, and that they're not drooping enough. This pic shows English native
But as my earlier link says, the colour of the pollen is the definitive difference, and the scent of course.
As this link from the Natural History Museum states, "....The flowers are usually deep violet-blue but paler blue forms (rarely white and very rarely pink) do occur...." and I photographed one yesterday in the centre of a 125 hectare Ancient Woodland