• Only available on the GBK app. • Cannot be used in conjunction with any other offer or promotion. • Offer valid Monday to Friday. • 20% off applies to food items only. • Offer not available for delivery or in Sainsbury's locations. • 20% student discount only available on the GBK app by signing up with your student email address - discount will be applied automatically. • GBK reserves the right to suspend, amend or cancel the offer where it becomes necessary to do so.