EC 8064 then EC 8375 at Gatwick
Barcelona → London → Milan
Timetable, London time
14:15EC 8064 from Barcelona at the gate
09:20EC 8375 to Milan leaves the gate
19 h 05 apart on the timetable, overnight
EC 8375 leaves 19 h 05 after EC 8064 arrives on the timetable: more than half a day, so not a connection we count.