FR 776 then FR 7808 at Barcelona
Venezia → Barcelona → London Luton
Timetable, Barcelona time
14:55FR 776 from Venezia at the gate
10:15FR 7808 to London Luton leaves the gate
19 h 20 apart on the timetable, overnight
FR 7808 leaves 19 h 20 after FR 776 arrives on the timetable: more than half a day, so not a connection we count.