FR 9601 then FR 2629 at Madrid
Rome → Madrid → London Stansted
Timetable, Madrid time
21:20FR 9601 from Rome at the gate
12:00FR 2629 to London Stansted leaves the gate
14 h 40 apart on the timetable, overnight
FR 2629 leaves 14 h 40 after FR 9601 arrives on the timetable: more than half a day, so not a connection we count.