Part CLASS II Buildings not frequented by people
A detached building—
(a)
into which people do not normally go; or
(b)
into which people go only intermittently and then only for the purpose of inspecting or maintaining fixed plant or machinery,
unless any point of such a building is less than one and a half times its height from
(i)
any point of a building into which people can or do normally go; or
(ii)
the nearest point of the boundary of the curtilage of that building,
whichever is the nearer.