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Thanks, Lavateraguy. That's what I thought (although I wasn't sure that there was such a thing as a white potentilla fruticosa), and what I put in my original notes, which somehow don't seem to have got posted with the photos. I've noticed before that this happens with uid plants - have you any idea why it doesn't include one's own tentative suggestions?
... is 'Abbotswood'. I don't know offhand what it's parentage is.
Lat/Lng: 53.609, -2.30277
OS grid ref: SD800125