We flew back on the A380, upper deck. Unfortunately this was a full flight, every seat taken, which we knew when we booked and had to select individual seats located one behind the other in the centre of the row. Normally I find the A380 spacious and would select a flight using this aircraft, but in doing so would select a window seat on the upper deck. This however is the first time I have found the seat restrictive, lacking legroom and generally uncomfortable, oh how I miss my window seat. Service on board appeared limited, likely due to the volume of passengers, but the entertainment system was reasonable. I'm glad we had access to the lounge before the flight for a drink and early evening meal.Unlike the vast majority of the flights with Singapore this one lacked that special Singapore Airlines touch - just average.