15 is the only end you can autoland on at the moment. If both ends were available and with virtually no wind you would use the end with the best RVR. I am very surprised that the airport chose the autumn, winter to work on the glidepath for 33. The lowest RVR recorded on the metars was 225 which should have been manageable for the Airbus and Boeings ,so I wonder if something else was going on to stop them getting in?