BA 349 then TK 1932 at Heathrow
Nice → London → Istanbul
Timetable, London time
21:05BA 349 from Nice at the gate
16:10TK 1932 to Istanbul leaves the gate
19 h 05 apart on the timetable, overnight
TK 1932 leaves 19 h 05 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.