can anyone ID this blue flower?

might be comfrey though the leaves look a little small,

try clearing around the flower , someone then may name it

Comfrey and nettles: perfect for making up your own liquid feed.

Monty Don was showing how to do this on Gardener's World this evening.

Yep! Comfrey, my neighbour put some in his garden and now it is everywhere as he moved out, new owners haven't tended the garden so its running wild, I hear their deep rooted too. The making of the comfrey liquid doesn't smell too great LOL but very good for your plant's :o))

thanks, all - eating nettle soup and shall recommend comfrey nurture!