I don't have a great deal of information behind this one but code seems to work on the website for 20% off and I've been told for today and tomorrow only. Could be handy coming up to Christmas.
Have fun.
EDIT: Screenshot of deal and barcode to use in-store via thebargainhunter on Instagram
EXCLUSIONS: https://www.davidjones.com/images/assetimages/pdf/exclusions…