IB 647 then BA 549 at Fiumicino
Madrid → Rome → London Heathrow
Timetable, Rome time
11:10IB 647 from Madrid at the gate
10:40BA 549 to London Heathrow leaves the gate
23 h 30 apart on the timetable, overnight
BA 549 leaves 23 h 30 after IB 647 arrives on the timetable: more than half a day, so not a connection we count.