Brummy, sorry to hear of your experience, however are you SURE the offer was £12 ? I've only ever seen Premium Economy available from c£200 each way, and I've always used online to book. Used it for the first time a couple of years ago and have booked the same again this year, despite it adding a couple of grand to the family holiday. I think if PE upgrade was available at £12, it would be unavailable within minutes, due to full take up.