Where a shop or betting worker opts out of Sunday working is the employer obliged to offer alternative hours on other days of the week?

No, where a shop or betting worker opts out of Sunday working, the employer is under no obligation to offer him or her alternative hours on other days of the week. By opting out of Sunday working, the employee consents to a variation of his or her terms and conditions. Whether or not the employer replaces the worker's Sunday hours with hours on other days of the week is a matter for negotiation between the employer and the employee.