IB 5341 then U2 2324 at Barcelona
Rome → Barcelona → London Luton
Timetable, Barcelona time
17:05IB 5341 from Rome at the gatealso LL 5341
10:20U2 2324 to London Luton leaves the gate
17 h 15 apart on the timetable, overnight
U2 2324 leaves 17 h 15 after IB 5341 arrives on the timetable: more than half a day, so not a connection we count.