Subject to subsection (2) below, if no works to which a scheduled monument consent relates are executed or started within the period of five years beginning with the date on which the consent was granted, or such longer or shorter period as may be specified for the purposes of this subsection in the consent, the consent shall cease to have effect at the end of that period (unless previously revoked in accordance with the following provisions of this section).

Subsection (1) above does not apply to a scheduled monument consent which provides that it shall cease to have effect at the end of a period specified therein.

If it appears to the Secretary of State to be expedient to do so, he may by a direction given under this section modify or revoke a scheduled monument consent to any extent he considers expedient.

Without prejudice to the generality of the power conferred by subsection (3) above to modify a scheduled monument consent, it extends to specifying a period, or altering any period specified, for the purposes of subsection (1) above, and to including a provision to the effect mentioned in subsection (2) above, or altering any period specified for the purposes of any such provision.

Part II of Schedule 1 to this Act shall have effect with respect to directions under this section modifying or revoking a scheduled monument consent.

Subject to subsection (2) below, if no works to which a scheduled monument consent relates are executed or started within the period of five years beginning with the date on which the consent was granted, or such longer or shorter period as may be specified for the purposes of this subsection in the consent, the consent shall cease to have effect at the end of that period (unless previously revoked in accordance with the following provisions of this section).

Subsection (1) above does not apply to a scheduled monument consent which provides that it shall cease to have effect at the end of a period specified therein.

If it appears to Historic Environment Scotland that it is expedient to modify or revoke a scheduled monument consent, it may by order under this section modify or revoke the consent to such extent as it considers expedient.

The power conferred by subsection (3) to modify or revoke a scheduled monument consent in relation to any works may be exercised at any time before those works have been completed, but the modification or revocation does not affect so much of those works as has been previously carried out.

Part II of Schedule 1 to this Act shall have effect with respect to F4orders under this section modifying or revoking a scheduled monument consent.