BA 675 then BA 1340 at Heathrow
Istanbul → London → Newcastle
Timetable, London time
20:00BA 675 from Istanbul at the gate
19:40BA 1340 to Newcastle leaves the gate
23 h 40 apart on the timetable, overnight
BA 1340 leaves 23 h 40 after BA 675 arrives on the timetable: more than half a day, so not a connection we count.