BA 793 then BA 15 at Heathrow
Göteborg → London → Sydney
Timetable, London time
21:10BA 793 from Göteborg at the gate
21:00BA 15 to Sydney leaves the gate
23 h 50 apart on the timetable, overnight
BA 15 leaves 23 h 50 after BA 793 arrives on the timetable: more than half a day, so not a connection we count.