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I probably misinterpreted the picture and it is only just coming into flower.
I felt the same as you, Martin, about misinterpretation! It is hard to get the scale and I could not see the anthers clearly. I thought the style looked longer than in multiflora, but I could be wrong. It seems a bit early for multiflora, but this year, who knows? Perhaps Tim Rich will adjudicate!
Lat/Lng: 57.24, -5.885
OS grid ref: NG656232