FR 4905 then BA 553 at Fiumicino
Palermo → Rome → London Heathrow
Timetable, Rome time
00:45FR 4905 from Palermo at the gate
13:20BA 553 to London Heathrow leaves the gate
12 h 35 apart on the timetable
BA 553 leaves 12 h 35 after FR 4905 arrives on the timetable: more than half a day, so not a connection we count.