Today (23 Nov), VH-ZNK arrived in LHR 15 minutes early at 0635 as QF1. FR24 asserts that QF2 today is to depart LHR at 2220 hours, 810 minutes later than the normal 0950 hours. I couldn't verify this through the Heathrow Airport site (didn't seem to work properly), but the QF site indicates that QF2 should depart 180 minutes late at 1250 hours from London Heathrow.
QF2116 (1510 hours SYD up to CFS) has VH-LQB, taking off at 1541 but then only travelling as far north as Singleton before starting a diversion that saw it land back in SYD. There have been storms approaching SYD from the northwest but I don't know if it was that, a problem with the aircraft, someone with a medical problem on board or some other occurrence.