U2 2323 then IB 5336 at Barcelona
London Luton → Barcelona → Rome
Timetable, Barcelona time
20:10U2 2323 from London Luton at the gate
10:05IB 5336 to Rome leaves the gate
13 h 55 apart on the timetable, overnight
IB 5336 leaves 13 h 55 after U2 2323 arrives on the timetable: more than half a day, so not a connection we count.