BA 773 then BA 818 at Heathrow
Oslo → London → Copenhagen
Timetable, London time
22:00BA 773 from Oslo at the gate
19:00BA 818 to Copenhagen leaves the gate
21 h apart on the timetable, overnight
BA 818 leaves 21 h after BA 773 arrives on the timetable: more than half a day, so not a connection we count.