LS 804 then BA 1369 at Manchester
Barcelona → Manchester → London Heathrow
Timetable, Manchester time
15:30LS 804 from Barcelona at the gate
15:00BA 1369 to London Heathrow leaves the gate
23 h 30 apart on the timetable, overnight
BA 1369 leaves 23 h 30 after LS 804 arrives on the timetable: more than half a day, so not a connection we count.