Found in rocky and grassy bank on outskirts of St Davids.
No interactions present.
Many thanks for ID; I thought it was Herb Robert when I saw it in the flesh, but convinced myself otherwise when reviewing the photographs at home. It was the structure of the leaves that "threw me", but re-examining HR, shows that I I should have stuck with my first assessment.
Lat/Lng: 51.8804, -5.2597
OS grid ref: SM757252