(1)A shop worker or betting worker to whom this section applies may at any time give his employer written notice, signed and dated by the shop worker or betting worker, to the effect that he objects to Sunday working.
(2)In this Act “opting-out notice” means a notice given under subsection (1) by a shop worker or betting worker to whom this section applies.
(3)This section applies to any shop worker or 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.