FR 3793 then BA 485 at Barcelona
Birmingham (UK) → Barcelona → London Heathrow
Timetable, Barcelona time
20:30FR 3793 from Birmingham (UK) at the gate
17:00BA 485 to London Heathrow leaves the gate
20 h 30 apart on the timetable, overnight
BA 485 leaves 20 h 30 after FR 3793 arrives on the timetable: more than half a day, so not a connection we count.