I just did a LHR-DXB turnaround just for miles on Nov 20. They had the new flat beds in C class which was almost empty both ways. I enjoyed the terrace lounges at both airports, the flight, the service and the superb duty free at DXB. I stayed for 2hours and 40 minutes and just for the fun cleared immigration and returned even though you can do it thro transit. The DXB airport is not Changi but comes close to it in terms of convenience