6.—(1) A betting worker to whom this paragraph applies may at any time give his employer written notice, signed and dated by the betting worker, to the effect that he objects to Sunday working.N.I.
(2) In this Schedule “opting-out notice” means a notice given under sub-paragraph (1) by a betting worker to whom this paragraph applies.
(3) This paragraph applies to any betting worker who under his contract of employment—
(a)is or may be required to work on Sunday (whether or not as a result of previously giving an opting-in notice); but
(b)is not employed to work only on Sunday.]