Picture posting is enabled for all :)
I bought some seeds for s type of Comfrey that wasn't supposed to self-seed... However, every year I get quite a few little comfrey plants dotted around the vicinity! I really don't mind as they are easy enough to weed our and obviously do wonders for the compost heap. I think they make a great garden plant - you get all the fertilising properties and the bees seem to adore them!
I bought mine from garden organic at Ryton. Brocking 14 that is.
Experiences vary; some people with the wild type report that it self-seeds everywhere, but that's never been my experience. One thing to bear in mind is that it's next to impossible to get rid of once it's established in a particular spot.