Thanks Noshed! I've PM'd Yana with my mobile and my itinerary, so hopefully we can meet up in Dartford week after next!
Just hope I remember to go dig up some roots!
I got the parent plant of my comfrey many years ago when my Mum had bad leg ulcers as I'd read about making a poultice with the roots to help heal the ulcer, but Mum would never try it, trusted the doctor's but her legs just kept getting worse.
Then took a cutting with me to Essex and another 6 years down the line brought a plant here with us in a big pot. A bit of root escaped the pot which was standing on the old patio, so I planted the comfrey down the side of the garden, now have 2 plants there, but I feel it must be a bocking as it's never inved anywhere else, apart from where I've planted it!