FR 6926 then U2 2324 at Barcelona
Rome → Barcelona → London Luton
Timetable, Barcelona time
20:20FR 6926 from Rome at the gate
10:25U2 2324 to London Luton leaves the gate
14 h 05 apart on the timetable, overnight
U2 2324 leaves 14 h 05 after FR 6926 arrives on the timetable: more than half a day, so not a connection we count.