CX 1750 then BA 465 at Madrid
Buenos Aires → Madrid → London Heathrow
Timetable, Madrid time
05:30CX 1750 from Buenos Aires at the gatealso BA 4252, QR 6919
18:10BA 465 to London Heathrow leaves the gate
12 h 40 apart on the timetable
BA 465 leaves 12 h 40 after CX 1750 arrives on the timetable: more than half a day, so not a connection we count.