Straggly, plant with tiny white flowers. Growing on shaded burn side.
No interactions present.
With 6 stamens and a flexuous stem this would be Cardamine flexuosa rather than Cardamine hirsuta.
However the impression I get is that the stem leaves and flowers are too large for Cardamine flexuosa, and it does not visibly have a hairy stem. (Noise and soft focus means that the absence of hairs is not 100% certain.) I would also expect more tightly clustered flowers.
The purple stamens and the shape of the leaflets matches Cardamine amara. However for C. amara I expect bright green foliage and a less flexuous stem.
The habit matches Nasturtium officinale agg., but I expect more rounded leaflets with this.
I'll try and get some better pictures and details some time in the next week.
Lat/Lng: 57.665361, -2.573037
OS grid ref: NJ659640