With respect to any relevant structure, a competent authority may enter into an agreement with the owner, lessee or occupier of the land on which the structure is situated which provides—
In this section—
but does not include a structure to which an agreement falling within section 146(5)(b) above relates, and
An agreement under this section may include such conditions as the competent authority think fit.
Those conditions may in particular include conditions expressed to have enduring effect—
Where an agreement under this section has been entered into in relation to any structure—
In subsection (5) above "the effective date" means—
For the purposes of section 143 above, any stile, gate or other structure replaced or improved in pursuance of an agreement under this section is to be deemed to be erected under this section only if any conditions included by virtue of subsection (4) above are complied with.
A competent authority may not enter into an agreement under this section except with the consent of every owner, lessee or occupier of the land on which the relevant structure is situated who is not a party to the agreement.
The Secretary of State may issue guidance to competent authorities as to matters to be taken into account for the purposes of this section; and in exercising their powers under this section competent authorities shall have regard to any such guidance issued to them.