BA 769 then BA 584 at Heathrow
Oslo → London → Milan Linate
Timetable, London time
13:30BA 769 from Oslo at the gate
13:15BA 584 to Milan Linate leaves the gate
23 h 45 apart on the timetable, overnight
BA 584 leaves 23 h 45 after BA 769 arrives on the timetable: more than half a day, so not a connection we count.