Passenger query. Suppose someone in the cabin had realised they were going to the wrong destination, what could have been done about it? As far as I can see, the pilots were instructed to fly to Edinburgh, which they did in a normal, safe, fashion. Would it be possible to change to an unplanned destination in flight? Would it be possible to calculate fuel adequacy in the time available? Would there even be time to make sure all the passengers wanted to go to Dusseldorf? Seems likely the safest plan would be to carry on to Edinburgh and write it off to a paperwork problem in the back office.