4. A white border must be added around the destination panel shown by the diagram—
(a)for item 1, 7 or 8, where it appears on an appropriate background provided for at item 2 of the sign table in Part 2;
(b)for item 2, where it appears on an appropriate background provided for at item 1 of the sign table in Part 2;
(c)for item 4, 5 or 6, where it appears on an appropriate background provided for at item 1 or 2 of that table.