It’s low tide around North Uist, a remote island off the West Coast of Scotland. Dark tendrils of seaweed lie glistening on the rocky shore, and a lone figure in orange waders moves methodically ...

3. Walk to the sea, then take a photo of your plot (with your back to the sea). 4. Walking away from the sea, thoroughly explore the whole of your five-metre-wide plot. Aim to cover the whole of your ...