They look like the basic Galanthus nivalis to me

Bamboo, there is no such thing as 'basic' Galanthus nivalis, tut, tut.
Whilst they look distinctive I am no galanthophile and am not going to attempt to put a name to them. There are those on this site who can do a much better job than me.

I'm not a galanthophile either - but this plant was pictured in one of my books and it said Galanthus nivalis underneath that particular one, but not under all the others, what can I say? Perhaps its not a very good book! Anyway, I understood G. nivalis to be the Common Snowdrop, and that is what I think this is.

I'd go with G nivalis too but as to which variety how knows? not me! I get really confused by all the different names.

Ashwood Nurseries site describes many different varieties of snowdrops. Worth a look. If you find out what it is let us know. They describe G Nivalis as the common snowdrop They are all gorgeous and a welcome sight early in the year. Often the differences are very subtle. Some have dark green markings on those inner petals, others like yours seem much lighter. In fact the first and third photographs seem to be different shapes as well as shades. Could they be different varieties.