So this is the aircraft that had a technical issue that started the rolling delays?On Sunday 3 July, A388 VH-OQD arrived at its LHR gate as QF7001 (i.e. a delayed 'QF1') at 2149 hours, 914 minutes late.
It quickly turned around and formed QF2, the 2105 hours ex LHR that departed at 0009 hours on Monday 4 (184 minute slate), but did not take off until 0043. Heathrow has only a limited number of takeoffs and landings in the 'small hours' so this move probably required permission. SIN arrival today is estimated as 2031 hours, 186 minutes behind the timetable, so SYD arrival on Tuesday 5 is likely to be after 0800 hours.