Fairly spindly, some stems tall and sturdier; in the tangled corner/edge of a garden, not yet escaped.
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Thanks for the ID, Chris. Looks like I'll be having another look, then getting in touch with Martin Rand,
Having re-checked, there are no escaped stems (just some tangled confusion around the garden), so not yet a record/escape. Still, interesting to know what it is.
Lat/Lng: 50.9, -1.4
OS grid ref: SU4719