This is only going to appeal to a niche market, but for those after a warm cotbed duvet, this is a real steal. They are very difficult to find at the best of times, but this is a real bargain to boot.
The item is only available instore, and you need to ask for the old stock, which is John Lewis code no: 31325116. It is a discontinued item, identical to the one to which the link goes, but in older packaging. Reduced from £35 to £15.
There still seem to be many around. Call the stores. If your local one doesn't have stock, they will check for you which ones do and give you the phone number of that store. It is John Lewis policy that if your local store doesn't stock the item you need, but another does, that store will post it free of charge. So, it's £15 delivered. I ordered it on Sunday and it arrived today.
If this doesn't appeal to you, ignore it. Don't vote cold because you think it an obscure item. It really is hard to find a 9 tog cotbed duvet, and this price is a bargain.