http://www.flickr.com/photos/wendymerle/2425929088/ ornithogalum balansae
If you put the name into google followed by the word 'image' you will get lots of pictures of them ie ornitholgalum images
Try looking at the Ornithogalum family - there are quite a few different ones but are very similar.
Don't think that it is wild garlic (Ramsons) as they have the flowers at the top of the stem not opening in a spike as this one seems to do. I know I know it but I just can't recall it yet.