7—(1) Each gas supplier and each gas conveyor shall, in such form and manner and with such frequency as the Authority may direct, take steps to inform the customers of gas suppliers of—
(a)the standards of overall performance determined under section 3 which are applicable to that gas supplier or gas conveyor; and
(b)the levels of performance achieved by that gas supplier or gas conveyor as respects each of those standards.
(2) In giving any such direction, the Authority shall not specify a frequency of less than once in every period of 12 months.