FR 5817 then BA 551 at Fiumicino
Bari → Rome → London Heathrow
Timetable, Rome time
15:35FR 5817 from Bari at the gate
12:15BA 551 to London Heathrow leaves the gate
20 h 40 apart on the timetable, overnight
BA 551 leaves 20 h 40 after FR 5817 arrives on the timetable: more than half a day, so not a connection we count.