New one for me - flying NCE-LHR tomorrow in Y, had selected 11D but clearly I've been the victim of curtain roulette as the seat map now shows Y starting at row 13. The website says "your seat has changed" but still has 11D listed as my seat; if I go in to the seat selection page, it won't let me choose a new one - as in, if I click a new seat, it doesn't go blue and the website doesn't register any change.