KL 1570 then BA 447 at Schiphol
Porto → Amsterdam → London Heathrow
Timetable, Amsterdam time
08:40KL 1570 from Porto at the gate
21:30BA 447 to London Heathrow leaves the gate
12 h 50 apart on the timetable
BA 447 leaves 12 h 50 after KL 1570 arrives on the timetable: more than half a day, so not a connection we count.