BA 1383 then BA 676 at Heathrow
Manchester → London → Istanbul
Timetable, London time
07:30BA 1383 from Manchester at the gate
06:55BA 676 to Istanbul leaves the gate
23 h 25 apart on the timetable, overnight
BA 676 leaves 23 h 25 after BA 1383 arrives on the timetable: more than half a day, so not a connection we count.