FR 9903 then U2 8518 at Lisbon
Rome → Lisbon → London Gatwick
Timetable, Lisbon time
20:15FR 9903 from Rome at the gate
19:25U2 8518 to London Gatwick leaves the gate
23 h 10 apart on the timetable, overnight
U2 8518 leaves 23 h 10 after FR 9903 arrives on the timetable: more than half a day, so not a connection we count.