BA 353 then MU 552 at Heathrow
Nice → London → Shanghai
Timetable, London time
08:45BA 353 from Nice at the gate
21:00MU 552 to Shanghai leaves the gate
12 h 15 apart on the timetable
MU 552 leaves 12 h 15 after BA 353 arrives on the timetable: more than half a day, so not a connection we count.