EC 3749 then IB 5418 at Barcelona
Milan → Barcelona → London Gatwick
Timetable, Barcelona time
21:30EC 3749 from Milan at the gate
18:00IB 5418 to London Gatwick leaves the gatealso LL 5418, VY 7622
20 h 30 apart on the timetable, overnight
IB 5418 leaves 20 h 30 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.