QR 3624 then IB 5408 at Barcelona
Rome → Barcelona → London Gatwick
Timetable, Barcelona time
01:05QR 3624 from Rome at the gatealso IB 5773, LL 5773, VY 6021
13:25IB 5408 to London Gatwick leaves the gatealso LL 5408, VY 7612
12 h 20 apart on the timetable
IB 5408 leaves 12 h 20 after QR 3624 arrives on the timetable: more than half a day, so not a connection we count.