I believe that BA can use them on any route for the summer season as the slots returned to the, and they have used them for the recently announced shorthaul routes such as Inverness, Billund, Palermo, Chania, and possibly for Tehran. The slots have to be reofferred for the winter season and they have to be on the specific routes, if no one takes them then they return back to BA and they can use them how they wish.