After that I went directly to the Østerport metro station back to the airport. No need to go back to the hotel as my luggage consisted of a single small backpack so I took it with me. Note, although it was small, it only just fit in the biggest lockers at the Rosenborg Castle and ended up nearly tipping over the stand of lockers trying to get it out after I had previously jammed it in. The metro was a lot busier on the way out than on the way in, standing room only for much of the journey.
Getting off at the other end a welcome sight awaited me. SAS Fast Track.