Subject to sub-paragraph (2), where any details, plans or schemes have been approved by the county planning authority under the provisions of any requirement, the county planning authority may at any time if it thinks fit approve amendments to the approved details, plans or schemes and following any further approval by the county planning authority the approved details, plans or schemes include the amendments approved under this requirement.

In considering any amendment to any details, plans or schemes the county planning authority must consult those persons it would have been required to consult before granting approval initially in relation to the details, plans, or schemes.