BA 1369 then BA 746 at Heathrow
Manchester → London → Geneva
Timetable, London time
16:00BA 1369 from Manchester at the gate
10:30BA 746 to Geneva leaves the gate
18 h 30 apart on the timetable, overnight
BA 746 leaves 18 h 30 after BA 1369 arrives on the timetable: more than half a day, so not a connection we count.