EC 3749 then EC 8064 at Barcelona
Milan → Barcelona → London Gatwick
Timetable, Barcelona time
08:40EC 3749 from Milan at the gate
07:25EC 8064 to London Gatwick leaves the gate
22 h 45 apart on the timetable, overnight
EC 8064 leaves 22 h 45 after EC 3749 arrives on the timetable: more than half a day, so not a connection we count.