Along the shore.
This is English Scurvy Grass, Cochlearis anglica. It grows around the coast of Britain and Northern Europe.
You need to look at the leaves to distinguish it from Common Scurvy Grass or Danish Scurvy Grass. The last of these is the one which has spread widely down the central reservations of our motorways helped by the salt spread on the roadways in winter.
These plants get their name from being taken on sailing ships in past centuries as eating the leaves was a defence against scurvy.
My extra is another shoreline shot showing how the leaves have suddenly sprung forth. On this one you can see the full length of the rail viaduct which is supported by 50 pillars.
PS some people have asked to see the fence Mrs. K is building so I have added another extra.