Subject to paragraph (2), the Secretary of State may authorise an islands or district council to exercise in relation to a private supply any power conferred on him by regulations 4 to 7; and accordingly, upon such authorisation, those regulations shall apply as if references to the Secretary of State were references to the council:

• Provided that nothing in this paragraph shall affect the power conferred on the Secretary of State by regulation 7(1) or permit an islands or district council to modify or revoke an authorisation granted by the Secretary of State.

An islands or district council may be authorised under paragraph (1) in relation to a private supply only if some or all of the premises served by the supply are within their area; and, where only some of those premises are within their area, only if the powers conferred on them by the authorisation are exercised jointly with, or with the consent of, any other such council in whose area the rest of the premises are situated.

Where an islands or district council grants an authorisation under regulation 4(1)(a) or (d), as applied to that council by virtue of paragraph (1), it shall notify that fact to the Secretary of State as soon as practicable thereafter.