Does anyone know what this plant is called

[NotwatchingSpooks]

Hi saw this but don’t know what it’s called. I thought it was lovely so would be grateful if anyone could tell me what it’s called please.

Is it Veronica spicata? Not that I am certain, as I don't grow it.

I’d say Liatris Spicats

It looks like liatris to me.

Spicata even 😳

Nigella??

I've got clumps of this all over the garden. I thought it was a weed.

Thank you very much