KL 1356 then U2 2514 at Schiphol
Prague → Amsterdam → London Luton
Timetable, Amsterdam time
16:00KL 1356 from Prague at the gate
14:15U2 2514 to London Luton leaves the gate
22 h 15 apart on the timetable, overnight
U2 2514 leaves 22 h 15 after KL 1356 arrives on the timetable: more than half a day, so not a connection we count.