FR 270 then W9 5378 at Barcelona
Milan → Barcelona → London Luton
Timetable, Barcelona time
17:10FR 270 from Milan at the gate
16:10W9 5378 to London Luton leaves the gate
23 h apart on the timetable, overnight
W9 5378 leaves 23 h after FR 270 arrives on the timetable: more than half a day, so not a connection we count.