EC 7154 then U2 2324 at Barcelona
Milan → Barcelona → London Luton
Timetable, Barcelona time
17:25EC 7154 from Milan at the gate
10:35U2 2324 to London Luton leaves the gate
17 h 10 apart on the timetable, overnight
U2 2324 leaves 17 h 10 after EC 7154 arrives on the timetable: more than half a day, so not a connection we count.