QR 3692 then IB 5408 at Barcelona
Rome → Barcelona → London Gatwick
Timetable, Barcelona time
17:05QR 3692 from Rome at the gate
13:25IB 5408 to London Gatwick leaves the gatealso LL 5408, VY 7612, BA 8066
20 h 20 apart on the timetable, overnight
IB 5408 leaves 20 h 20 after QR 3692 arrives on the timetable: more than half a day, so not a connection we count.