FR 3977 then FR 8215 at Barcelona
Dublin → Barcelona → London Stansted
Timetable, Barcelona time
21:10FR 3977 from Dublin at the gate
13:15FR 8215 to London Stansted leaves the gate
16 h 05 apart on the timetable, overnight
FR 8215 leaves 16 h 05 after FR 3977 arrives on the timetable: more than half a day, so not a connection we count.