Do not dispose of duvets, pillows and cushions at home. Take this waste to your local recycling centre (RC).
Which RC container
Use the general waste container.
Which RC accept this waste
All our recycling centres accept duvets.
You could also...
ask a local animal shelter or veterinary hospital if they could use them. They may accept old duvets, quilts pillows and cushions to help keep animals warm and comfortable.