(1) A termination of weekly payments payable under section 164 has effect—
(a) without the giving of notice; and
(b) as from—
(i) the day on which the worker ceases to suffer incapacity resulting from, or materially contributed to by, the subsequent surgery; or
(ii) the expiry of the period of 13 weeks commencing on the day on which the relevant surgery is performed—
whichever first occurs.
(2) A termination or alteration of weekly payments on the grounds specified in section 169, 171, 172, 175(1), 177 or 347(1) has effect—
(a) without the giving of notice; and
(b) as from the day on which the circumstances establishing the relevant ground first arise.
(3) A termination of weekly payments under section 170 has effect—
(a) without the giving of notice; and
(b) as from the expiry of the period not exceeding 13 weeks for which the payment is granted under that section.
(4) A reduction of weekly payments solely on the ground of the expiry of the first entitlement period has effect if—
(a) written notice in accordance with section 188 is given; and
(b) section 190 has been complied with.
(5) A termination of weekly payments solely on the ground of the expiry of the second entitlement period has effect if—
(a) written notice in accordance with section 188 is given; and
(b) section 191 has been complied with.