IB 648 then FR 348 at Madrid
Rome → Madrid → London Stansted
Timetable, Madrid time
14:35IB 648 from Rome at the gate
13:15FR 348 to London Stansted leaves the gate
22 h 40 apart on the timetable, overnight
FR 348 leaves 22 h 40 after IB 648 arrives on the timetable: more than half a day, so not a connection we count.