So what do you think this is?

[Palustris]

I think I know, but it has the wrong number of petals and the central boss of stamens is wrong.

[Philippe]

ANemone nemorosa always has a lot of foliage at flowering time.
A pale hepatica nobilis for me, no? I think I see an old hairy leave of it on the right, under what should be a ranunculus ficaria leave.

[Palustris]

Sorry, I labelled the photo wrongly. Yes it is a Hepatica, but even more important, how did it get where it is? It is in the middle of a self seeded patch of Anemone nemorosa and Ranunculus ficaria, a good 80 metres away from the nearest Hepatica and the ones up the garden are either , pink or shades of blue. That's is what had me fooled for a moment. Oh, that and the fact that there are no obvious leaves to it!