BA 669 then BA 1378 at Heathrow
Marrakesh → London → Manchester
Timetable, London time
20:20BA 669 from Marrakesh at the gate
18:00BA 1378 to Manchester leaves the gate
21 h 40 apart on the timetable, overnight
BA 1378 leaves 21 h 40 after BA 669 arrives on the timetable: more than half a day, so not a connection we count.