Biennial and the roots are edible. Let it seed if you want more.
And if you are really desperate the roots of Silverweed are supposed to be edible. But definitely don't take my word for that, look it up before trying!
It was a Hebe of some sort.
It is a Potentilla but not the one generally called Silverweed. The leaves are too green and not as serrated as Silver weed. I could go out and take a picture of the latter, but it is too dratted cold!
Or Viburnum tinus with a bad case of Viburnum beetle?
Or a Rowan in full bloom. Some folks find the scent from them rather lass than pleasant.
They have the look of Lychnis chalecdonica, but the way my id giving is going at the moment they could be anything but!
He did say the flowers were blue!!!!!!!!!!!!
Funny you should ask about a white Muscari, I have got some in a place where there has never been any Muscari at all. They are not white M. ambrosiacum either. The flowers are slightly different and less tightly packed. Wonder if they have come in compost from plants we have bought?