@ True Blue - here's the official take on the ADT glitch.....
Important Information regarding Email Travel Itineraries
Since moving to our new system last week, we have experienced some minor problems with the presentation of passenger names in the email itinerary sent to customers after a flight is purchased. Some passengers' surnames appear in the email with the letters ADT added to the end of the surname. We would like reassure all customers that the full surname (as booked) is correctly stored in our booking system and will not impact the booking process.