BA 813 then BA 860 at Heathrow
Copenhagen → London → Prague
Timetable, London time
16:55BA 813 from Copenhagen at the gate
16:45BA 860 to Prague leaves the gate
23 h 50 apart on the timetable, overnight
BA 860 leaves 23 h 50 after BA 813 arrives on the timetable: more than half a day, so not a connection we count.