Paragraph 168 Deviation of authorised developmentI1

Notwithstanding article 5 of the Order (Power to maintain the authorised development) the undertaker is not permitted to install or deviate vertically the authorised works to a limit less than 2.5 metres below the surface of the ground and no closer than 600mm provided that where directional drilling methods are to be used this minimum distance shall be increased to a 1.5 metre clearance from the apparatus.