We use Tesco home delivery. Just had a delivery that included a number of packs of chicken-based snacks. Half of them turned out to be already four days past their "use by" date, very glad I noticed!
We've been using the service for a while and had a few cases of damaged items, or items that were about to go off when the website promised they'd be good for a week, that sort of thing, and Tesco have always refunded for them, which I've been fine with. Chicken that went off four days ago is a bit more serious, though. WIBU to ask for more compensation than a straight refund, since they'd be in a bunch of trouble if Trading Standards were to find out?