In this Part “high hedge” means so much of a barrier to light or access as—
is formed wholly or predominantly by a line of two or more evergreens; and
rises to a height of more than two metres above ground level.
For the purposes of subsection (1) a line of evergreens is not to be regarded as forming a barrier to light or access if the existence of gaps significantly affects its overall effect as such a barrier at heights of more than two metres above ground level.
In this section “evergreen” means an evergreen tree or shrub or a semi-evergreen tree or shrub.