BA 1383 then BA 474 at Heathrow
Manchester → London → Barcelona
Timetable, London time
08:00BA 1383 from Manchester at the gate
07:30BA 474 to Barcelona leaves the gate
23 h 30 apart on the timetable, overnight
BA 474 leaves 23 h 30 after BA 1383 arrives on the timetable: more than half a day, so not a connection we count.