The message
from Sacha contains these words:

(Kiftsgate)

Oh, it's a beautiful thing, really lovely. But it's vigorous beyond
imagining. In my last garden, the people next door had two. Both had gone
right to the top of mature walnut trees and had started to 'colonise' other
trees, including some in my garden, which was bordered at that point by a
10' granite wall. I had all the pleasure of it and none of the work. ;-)

Rosa triffida?