BA 1361 then BA 578 at Heathrow
Manchester → London → Milan Linate
Timetable, London time
11:30BA 1361 from Manchester at the gate
11:25BA 578 to Milan Linate leaves the gate
23 h 55 apart on the timetable, overnight
BA 578 leaves 23 h 55 after BA 1361 arrives on the timetable: more than half a day, so not a connection we count.