QF 1 then BA 418 at Heathrow
Sydney → London → Luxembourg
Timetable, London time
06:15QF 1 from Sydney at the gate
06:05BA 418 to Luxembourg leaves the gate
23 h 50 apart on the timetable, overnight
BA 418 leaves 23 h 50 after QF 1 arrives on the timetable: more than half a day, so not a connection we count.