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Until I misidentified another plant as it -
Fortunately, a local botanist put me right, and told me where to find this species fairly close nearby. It was past its best, but I know where to look next season!
I have not seen my usual plants as the area has been taken over by brambles. They are stunning plants, hopefully next year :)
... flowers early in the year.
Lat/Lng: 51.6, 0.3
OS grid ref: TQ5999