U2 1683 then BA 561 at Fiumicino
Nice → Rome → London Heathrow
Timetable, Rome time
07:55U2 1683 from Nice at the gate
20:35BA 561 to London Heathrow leaves the gate
12 h 40 apart on the timetable
BA 561 leaves 12 h 40 after U2 1683 arrives on the timetable: more than half a day, so not a connection we count.