The Authority may increase, reduce or terminate weekly payments of a member by serving the member with a written notice which must state—
(a) in the case of an increase or reduction—
(i) the new level of weekly payments; and
(ii) when the new level of weekly payments will commence; and
(b) in the case of a termination, when weekly payments will stop; and
(c) the reasons for the increase, reduction or termination of weekly payments.