BA 349 then BA 1338 at Heathrow
Nice → London → Newcastle
Timetable, London time
21:05BA 349 from Nice at the gate
16:05BA 1338 to Newcastle leaves the gate
19 h apart on the timetable, overnight
BA 1338 leaves 19 h after BA 349 arrives on the timetable: more than half a day, so not a connection we count.