I can't remember planting it, but that's not unusuall!
Hi Richard. Its comfrey you've got there.
Thanks Ladybird. I wonder where that came from? It obviously likes living on a cold, wet and windy hilltop.
It can be a bit of a thug but bees love it.
I think the birds bring it. I have had one with white flowers spring up. I know I didn't plant it.