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The buds would be drooping if it was E palustre. Perhaps, E obscurum. The stigmas could be undivided, it is hard to tell.
I think you need measurements plus sometimes the flowers don't droop that much,I have is as a weed in my garden and size can vary depending on the nutrient content and how favourable the conditions are,so I don't think you can alway's ID something by its size.
I will try and take better photos of the flower next time I have the opportunity. Following cicuta58's I've been looking at photos of E obscurum, and it does seem to be a possibility.
Lat/Lng: 58.0582, -5.4245
OS grid ref: NB980128