Offer valid all day on Sundays. Offer entitles two adults and two children under 150cm to eat in Cosmo Derby for £36. The offer is for food only and does not include drinks. Offer cannot be used in conjunction with any other offer, deal or promotion. Offer includes Mother’s Day. To claim the offer, just show your server the Facebook post, or this page, on your mobile device. COSMO Derby reserves the right to withdraw the offer at any time. Available at COSMO Derby only.