EC 7152 then EC 8064 at Barcelona
Milan → Barcelona → London Gatwick
Timetable, Barcelona time
16:10EC 7152 from Milan at the gate
12:50EC 8064 to London Gatwick leaves the gate
20 h 40 apart on the timetable, overnight
EC 8064 leaves 20 h 40 after EC 7152 arrives on the timetable: more than half a day, so not a connection we count.