BA 349 then BA 318 at Heathrow
Nice → London → Paris Charles de Gaulle
Timetable, London time
21:05BA 349 from Nice at the gate
17:15BA 318 to Paris Charles de Gaulle leaves the gate
20 h 10 apart on the timetable, overnight
BA 318 leaves 20 h 10 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.