Although not SIN-LHR, Last week I did SYD-JFK(via LAX) on QF and I must say I prefer BA based on the following:

1) IFE - No AVOD on the plane and even from my experience a few weeks back on BKK-SYD with AVOD, the system does not bloody work 1/2 of the time. Therefore IFE is the same as BA and the choice is not that great

2) the Seat. Although it is longer, but really I find sleepign at the incline is jsut not comfortable and I had back pains when arriving at JFK (after 18+ hours on the seat). The BA beds are much better and I really DON't understand why people say the width is an issue as I find the QF seats (actual surface ares where you BUM sits) are the same as BA. The stupid QF side arm rest does not retract fully down so you still can't spread out like they show on the picture

3) Catering - absoulte joke. Really the entree and the main course were pretty bad (they try to be creative for eg. Bean Mash rather than just simple potatoes) and it just tasted like.... The seared Tuna looked so dried I only ate the salad. Also the snack menu is pretty bad with only sandwiches.

One more thing. I don't understand why there is a lack of WATER on board. They ran out of the individual bottle water and then they ran out of all mineral water. Really how can they do this. and it is NOT just an isolated incident. On my F Class BKK-SYD, same thing happen. Really I think refilling a bottle is not acceptable in J and F Class.

Service - typical QF, nothing special.