BA 349 then KL 1010 at Heathrow
Nice → London → Amsterdam
Timetable, London time
21:05BA 349 from Nice at the gate
15:45KL 1010 to Amsterdam leaves the gate
18 h 40 apart on the timetable, overnight
KL 1010 leaves 18 h 40 after BA 349 arrives on the timetable: more than half a day, so not a connection we count.