FR 6974 then IB 5406 at Barcelona
Rome → Barcelona → London Gatwick
Timetable, Barcelona time
22:25FR 6974 from Rome at the gate
12:30IB 5406 to London Gatwick leaves the gatealso LL 5406, VY 7610
14 h 05 apart on the timetable, overnight
IB 5406 leaves 14 h 05 after FR 6974 arrives on the timetable: more than half a day, so not a connection we count.