This deal from Wowcher
From £39.99 for a 15 Tog Duck Feather and Down Duvet – 4 Sizes! from Direct Warehouse Ltd – save up to 43%
Sizes: Single, double, king and super king. Filling: 85% duck feather. 15% duck down. 10.5 and 4.5 tog. 700 + 300 GSM. Cover: 233 thread count. 100% microfiber down-proof. Adaptable: Each duvet has a 10.5 tog and a 4.5 tog, which means you can remove either one to suit to your desired temperature! Care: Machine washable at 40′. Can be tumble dried. Do NOT bleach, dry clean or iron. Ideal: For those who want to improve the quality of their sleep!