VK are moving from LHR to LGW in late Nov, and VS LGW-PHC pax are being rebooked to VK LGW-LOS-PHC (so sez VS website).
Timings of VK LGW and JNB services indicate a second aircraft, presumably one replaced by the A346 due (according to Jethros) this month.
There is a longstanding thread in African Aviation
here