FR 7807 then FR 3792 at Barcelona
London Luton → Barcelona → Birmingham (UK)
Timetable, Barcelona time
17:45FR 7807 from London Luton at the gate
17:20FR 3792 to Birmingham (UK) leaves the gate
23 h 35 apart on the timetable, overnight
FR 3792 leaves 23 h 35 after FR 7807 arrives on the timetable: more than half a day, so not a connection we count.