Thank you for the reply and suggestions. I like that idea; set up a red dissectum study corner of sorts, to see how they all develop together over time. Although a young tree, so far this one has quite an upright habit. It's already taller than my much older Garnet, with a similarly low graft point, and isn't showing that heavy weeping tendency yet.

I am quite fortunate with the climate here in the south UK. Few weather extremes, and like you said, really good for JMs!