Yes, comfrey. It looks just like the patch that I dug out yesterday. I have a variegated one and sometimes it produces reverted plain green clumps that are much more vigorous.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
It looks the same as the one I have which I think is iberian comfrey, perhaps Wisley blue. It's a creeping comfrey and better behaved than most of the others. It's and so positively humming with bees this time of year and on an off till winter.
It's also very useful as a food for plants, if you want to use the leaves for that @buddyandmorse. You soak the foliage in water, weigh it down, and the liquid produced can be diluted and used on your garden
There's various threads about it - I think there was a recent one, if that's of any interest to you.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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Maybe Symphytum Hidcote Blue ....a dwarf one.
https://www.google.com/search?q=symphytum+hidcote+blue&client=firefox-b-d&hl=en&sxsrf=APq-WBvU7w1ooNhfINXtvgQOD_c30Em4Yg:1649695787729&source=lnms&tbm=isch&sa=X&ved=2ahUKEwj-2ajbu4z3AhVllFwKHTlpD5sQ_AUoAnoECAEQBA&biw=1276&bih=559&dpr=1.5
In the sticks near Peterborough
There's various threads about it - I think there was a recent one, if that's of any interest to you.
I live in west central Scotland - not where that photo is...