FR 6596 then BA 479 at Barcelona
Manchester → Barcelona → London Heathrow
Timetable, Barcelona time
21:05FR 6596 from Manchester at the gate
13:35BA 479 to London Heathrow leaves the gate
16 h 30 apart on the timetable, overnight
BA 479 leaves 16 h 30 after FR 6596 arrives on the timetable: more than half a day, so not a connection we count.