What's up with all of you? That flight LHR-PER might be in the ultra-long-haul category, but as long as oil stays cheap these flights are here to stay and even more routes will be started. LHR-PER is just a tad longer than DXB-AKL. On February, 6th QR will start DOH-AKL, which will be even longer and blocked at 17 hours.
Credit to http://www.gcmap.com
And saying these flights are too long just seems not right. People flying longhaul frequently get annoyed by "too short" longhaul flights which don't give you enough time to sleep. Your usual longhaul 9 hour flight has a one hour climb and one hour descent phase. Then you have one or two meal services. You might end up with 5 hours of useable time to sleep. But because sleeping on an aircraft isn't that easy for many people, the real time will be even shorter.
So flights in the 14-17 hour category will be much better for the bio-rythm of the human body, then stopping somewhere inbetween. You can relax, have two full meal services (instead of a meal and a small snack), you will have 8 hours of sleep and even can watch movie. Of course Y shouldn't be configured as tight as on regular, shorter longhaul-flights. But I say, there might be people avoiding such a long flight, but there will be more people paying a premium to get on the non-stop service. Even people from SYD and MEL, who don't want to transfer in Dubai at 3 o'clock in the night...
Good luck QF!