OK at this point a little levity on all this computer stuff. Years ago, it was Easter 1979 and I checked in for a SQ flight to LHR. I was travelling in Y and I absolutely had to fly as I was attending my sister's wedding the next day. In those days the checkin staff took the paper ticket (don't you just miss those?) and gave me a boarding pass with a sticker on it from the board behind her with the seat number on it. (So simple, why did they change that?) I was sitting at a window exit on a 747. I boarded as soon as I could given my anxiety to make sure I was going. I sat down. Now, for arguments sake my name is Mr John Smith, and there it was on the ticket and the boarding pass. Up comes another young white guy who says I am sitting in his seat. No way am I moving. Cabin crew come up and inspect my boarding pass and his, and low and behold his name is Mr John Smith. Difference is I'm travellling on a British passport, he on an Aussie one. I remain firmly sitting. My namesake is asked to wait a moment. Back comes the crew member and says Mr Smith will have a seat in First! You can imagine the look of victory on that guy's face. But I made the wedding.