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I opted for this as the site is Perth & Kinross; is Touch-me-not seen that far North?
Nev I think you are right with I. parviflora, there are to many teeth on the leaves for I. noli-tangere, I thought the spur on the flower was to long and curved for Small Balsam.
Lat/Lng: 56.6134, -3.9214
OS grid ref: NN821484