9.—(1) A draft revision must contain a diagram, called a key diagram, illustrating the policies contained in the draft revision.
(2) A draft revision may also contain a diagram, called an inset diagram, which–
(a)is drawn to a larger scale than the key diagram, and
(b)illustrates the application of the policies to part of the area covered by the revision.
(3) Where a draft revision contains an inset diagram–
(a)the area covered by the inset diagram must be identified on the key diagram, and
(b)the application of the policies to that area must be illustrated on the inset diagram only.
(4) Key diagrams and inset diagrams must–
(a)set out the title of the draft revision, and
(b)include an explanation of any symbol or other notation that appears on them, and
(c)be prepared otherwise than on a map base.