BA 483 then BA 1376 at Heathrow
Barcelona → London → Manchester
Timetable, London time
19:25BA 483 from Barcelona at the gate
18:00BA 1376 to Manchester leaves the gate
22 h 35 apart on the timetable, overnight
BA 1376 leaves 22 h 35 after BA 483 arrives on the timetable: more than half a day, so not a connection we count.