Echium vulgare, Boraginaceae
I personally love naturally blue wildflowers and the Boraginaceae is one of those families that gifts us with many of the surprises you encounter on the side of old roads and disturbed drier areas in Europe. Viper’s bugloss is one of them, and I found a few plants in the same spot where it was growing last year, so it’s self-seeding and spreading. They grow on a sunny slope facing the river Clyde, in well-draining soil with a thin top layer, which is pretty ideal for them. The curling spikelets and pink flower buds which turn bright blue upon opening are clear indicators you are observing a member of the Boraginaceae (other examples I wrote about are the water forget-me-not and rough comfrey), and as you can see it’s easy to find bumblebees busy on any of them, viper’s bugloss included.
The plant is reportedly edible but not particularly palatable, and also potentially toxic, so is definitely best sown as part of a group of bee and wildlife attracting wildflower species, especially in drier areas of the garden, where it will do well with little care.