Summer snowflakes?

These flowers are thriving on one edge of Kinnoull Hill. I think they must be summer snowflakes, although the flowers lack green tips. If so, they are not supposed to be naturalised in Scotland!

Update - it's few-flowered leek, aka few-flowered garlic, an invasive species. It was certainly carpeting the ground thickly here. Strangely, there was no smell on a wet day, even though Mrs P rubbed a leaf.  https://en.wikipedia.org/wiki/Allium_paradoxum