BA 929 then BA 818 at Heathrow
Hannover → London → Copenhagen
Timetable, London time
18:50BA 929 from Hannover at the gate
18:45BA 818 to Copenhagen leaves the gate
23 h 55 apart on the timetable, overnight
BA 818 leaves 23 h 55 after BA 929 arrives on the timetable: more than half a day, so not a connection we count.