3O 373 then BA 495 at Barcelona
Casablanca → Barcelona → London Heathrow
Timetable, Barcelona time
08:153O 373 from Casablanca at the gate
20:45BA 495 to London Heathrow leaves the gate
12 h 30 apart on the timetable
BA 495 leaves 12 h 30 after 3O 373 arrives on the timetable: more than half a day, so not a connection we count.