EC 7154 then IB 5416 at Barcelona
Milan → Barcelona → London Gatwick
Timetable, Barcelona time
23:15EC 7154 from Milan at the gate
17:45IB 5416 to London Gatwick leaves the gatealso LL 5416, VY 7620, BA 8074
18 h 30 apart on the timetable, overnight
IB 5416 leaves 18 h 30 after EC 7154 arrives on the timetable: more than half a day, so not a connection we count.