BA 349 then BA 1460 at Heathrow
Nice → London → Edinburgh
Timetable, London time
21:05BA 349 from Nice at the gate
18:25BA 1460 to Edinburgh leaves the gate
21 h 20 apart on the timetable, overnight
BA 1460 leaves 21 h 20 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.