[F1Contractual requirements relating to Sunday workN.I.
9.—(1) Where a betting worker gives his employer an opting-out notice, the contract of employment under which he was employed immediately before he gave that notice becomes unenforceable to the extent that it—N.I.
(a)requires the betting worker to do betting work on Sunday after the end of the notice period; or
(b)requires the employer to provide the betting worker with betting work on Sunday after the end of that period.
(2) Subject to sub-paragraph (3), any agreement entered into between an opted-out betting worker and his employer is unenforceable to the extent that it—
(a)requires the betting worker to do betting work on Sunday after the end of the notice period; or
(b)requires the employer to provide the betting worker with betting work on Sunday after the end of that period.
(3) Where, after giving an opting-in notice, an opted-out betting worker expressly agrees with his employer to do betting work on Sunday or on a particular Sunday (and so ceases to be opted-out), his contract of employment shall be taken to be varied to the extent necessary to give effect to the terms of the agreement.
(4) For the purposes of paragraph 7(1)(b), the appropriate date in relation to this paragraph is the day on which the agreement is entered into.]