Could be going to DAO at Roskilde as stated for maintenance. It may also be going for mods to be done. These could be required to place the aircraft on the UK register. Also this could be part of the process for the type to be put on the AOC. There would have been a considerable amount of flight training going on to bring sufficient aircrew up to the required standard to fly with out training going on. You have to think of training as starting at the apex of a triangle. You start with Training Captains, then Captains then Firstofficers. All being done on the Portuguese register under there TRTO.
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