FR 6596 then BA 485 at Barcelona
Manchester → Barcelona → London Heathrow
Timetable, Barcelona time
21:05FR 6596 from Manchester at the gate
17:00BA 485 to London Heathrow leaves the gate
19 h 55 apart on the timetable, overnight
BA 485 leaves 19 h 55 after FR 6596 arrives on the timetable: more than half a day, so not a connection we count.