29.—(1) Where an activity carried out by a duty holder significantly increases the risk of a major accident the duty holder must take suitable measures to ensure that the risk is reduced as low as is reasonably practicable.
(2) The measures referred to in paragraph (1) include, where necessary, suspending the relevant activity until the risk is adequately controlled.
(3) The duty holder must notify the competent authority where it has taken measures under paragraph (1).
(4) The duty holder must comply with paragraph (3) immediately after, and in any event no later than 24 hours after, adopting the measures.
(5) In this regulation (but not this paragraph) a reference to a duty holder includes a reference to a well operator.