FR 6974 then LA 5772 at Barcelona
Rome → Barcelona → London Gatwick
Timetable, Barcelona time
22:25FR 6974 from Rome at the gate
11:00LA 5772 to London Gatwick leaves the gate
12 h 35 apart on the timetable, overnight
LA 5772 leaves 12 h 35 after FR 6974 arrives on the timetable: more than half a day, so not a connection we count.