BA 373 then BA 1376 at Heathrow
Toulouse → London → Manchester
Timetable, London time
18:05BA 373 from Toulouse at the gate
18:00BA 1376 to Manchester leaves the gate
23 h 55 apart on the timetable, overnight
BA 1376 leaves 23 h 55 after BA 373 arrives on the timetable: more than half a day, so not a connection we count.