PLant help please

PLant help please

Observation - PLant help please - UK and Ireland. Description: Approx 3cm high growing on sand dune in West Wales. Photo shows small white flowers and fruits held at angle to stem. I'm thinking cabbage family but a bit puzzled! Any help appreciated.

Approx 3cm high growing on sand dune in West Wales. Photo shows small white flowers and fruits held at angle to stem. I'm thinking cabbage family but a bit puzzled! Any help appreciated.