Close to water.
No interactions present.
Petals not notched/ cleft( Fitter et al) so consider Common Scurvygrass Cochlearia officinalis or similar. Ideally a bit more leaf & seed pods help the i.d..
Small leaves on flower stem appear to be arrow/spear shaped as they get smaller & higher up the stem.
Lat/Lng: 57.223, -6.064
OS grid ref: NG547220