BA 373 then BA 928 at Heathrow
Toulouse → London → Hannover
Timetable, London time
18:00BA 373 from Toulouse at the gate
15:45BA 928 to Hannover leaves the gate
21 h 45 apart on the timetable, overnight
BA 928 leaves 21 h 45 after BA 373 arrives on the timetable: more than half a day, so not a connection we count.