BA 349 then TP 1361 at Heathrow
Nice → London → Lisbon
Timetable, London time
21:05BA 349 from Nice at the gate
16:30TP 1361 to Lisbon leaves the gate
19 h 25 apart on the timetable, overnight
TP 1361 leaves 19 h 25 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.