This is European box (Buxus sempervirens) situated within the grounds at The Grange, a work of art in itself.  Possibly planted 150+ years ago when the home was built.  It brings to mind Ash Dome, a living sculpture made by the artist David Nash in North Wales (a circle of 22 ash trees that gradually change over time, like the environment around it).  I’m particularly keen to make a connection to this fine specimen in the herb garden and initial ideas include cloud pruning the box already in the garden, exposing stems of the plant to create some interesting negative spaces.