EC 3749 then LA 5772 at Barcelona
Milan → Barcelona → London Gatwick
Timetable, Barcelona time
21:30EC 3749 from Milan at the gate
11:00LA 5772 to London Gatwick leaves the gate
13 h 30 apart on the timetable, overnight
LA 5772 leaves 13 h 30 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.