W4 6136 then W4 6003 at Fiumicino
Prague → Rome → London Luton
Timetable, Rome time
17:00W4 6136 from Prague at the gate
12:10W4 6003 to London Luton leaves the gate
19 h 10 apart on the timetable, overnight
W4 6003 leaves 19 h 10 after W4 6136 arrives on the timetable: more than half a day, so not a connection we count.