KL 1510 then BA 8450 at Schiphol
Barcelona → Amsterdam → London City
Timetable, Amsterdam time
08:20KL 1510 from Barcelona at the gate
08:05BA 8450 to London City leaves the gate
23 h 45 apart on the timetable, overnight
BA 8450 leaves 23 h 45 after KL 1510 arrives on the timetable: more than half a day, so not a connection we count.