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I am not absolutely sure, but it looks to me that your photo on the right shows calyx lobes that are longer than wide.
Thanks for comments, Phil. On reviewing photos, I see what you mean, although I still think some of the calyx lobes would pass as equilateral. Guess M. laxa would be a possibility, although on balance still leaning more towards M. scorpioides. However, I may well be wrong!!
Lat/Lng: 55.78898, -4.20168
OS grid ref: NS620572