Sorry, I thought the TLA DSA would be obvious in this folder.
DSA = Finningley = Donny Airport = Doncaster Sheffield Airport = Robin Hood Airport. Most of the locals would have liked either Doncaster International (said with only a touch of irony) or Finningley. If Heathrow could keep that name, why not Finningley?
It turns out that it was a training session moved from Brize due to weather. It is a shame he only overflew chez moi once.