FR 6597 then BA 1365 at Manchester
Barcelona → Manchester → London Heathrow
Timetable, Manchester time
19:50FR 6597 from Barcelona at the gate
11:55BA 1365 to London Heathrow leaves the gate
16 h 05 apart on the timetable, overnight
BA 1365 leaves 16 h 05 after FR 6597 arrives on the timetable: more than half a day, so not a connection we count.