VS 479 then BA 418 at Heathrow
Cape Town → London → Luxembourg
Timetable, London time
06:50VS 479 from Cape Town at the gate
06:05BA 418 to Luxembourg leaves the gate
23 h 15 apart on the timetable, overnight
BA 418 leaves 23 h 15 after VS 479 arrives on the timetable: more than half a day, so not a connection we count.