I may be the last to know but wanted to share in case not.
Ages ago I returned 2 t shirts to John Lewis. Went to the post office with the JL returns label on the package. Counter staff scanned the item and suck a barcode on my package. I got a receipt and I thought all fine.
Parcel didn't turn up so put a claim through the Royal Mail website. I have had a letter in today saying they admit the package is lost but a refund isn't possible because I didn't return the t shirts through a proper way. Although the items were tracked they are not insured. Just want to let others know as I know lots of you order lots online. Free online returns may not get there and if lost you are likely not to be covered. I have lost £24.