The one time I had the misfortune to be dragged into the Next sale, my boyfriend found a nice coat, down to £45 from £70, so he duly queued up. 45m later, he gets to the front of the till, and the woman says it was mis-advertised, and she can't sell it to him. It was the only item he picked up, so 45m queuing for nothing.
We went in the next day on the off chance, and it was priced at £55. I would have thought that £10 wasn't such a great loss as to send a customer away VERY unhappy with their service!