BA 349 then BA 277 at Heathrow
Nice → London → Hyderabad
Timetable, London time
21:05BA 349 from Nice at the gate
14:35BA 277 to Hyderabad leaves the gate
17 h 30 apart on the timetable, overnight
BA 277 leaves 17 h 30 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.