I cannot help with rose identification, David, but thank you for the photos, they are lovely, a nice 'inheritance'! May I ask what sort of ash you used? Just wood ash from the fireplace?
There is something deeply satisfying about growing plants obtained, shall we say, unusually. I love your story about the nunnery, Charitea! Not as evocative, but I have some plants which I have grown on from pruned branches and potted plants left out by the rubbish bins. January is a good time for poinsettias! Last spring some mystery hippeastrums which had finished flowering were being sold for 50 cents a pop -- I bought half a dozen and 4 are now flowering: two creamy whites, a white white, and a white and pink.
Sorry, that was a bit off-topic...
I will post when I have photos of all the roses' flowers.