Of course QF will sell that routing on QF metal but the route is in the future and could change by then in true QF fashion I still remember the QF ORD-LAX-SYD service that was cancelled the week of the first flight, so nothing is sure when it comes to QF future schedules.. EK also flies F MEL-SIN but I doubt that fare would be attractive combined with QF SIN-LHR.