FR 270 then FR 8215 at Barcelona
Milan → Barcelona → London Stansted
Timetable, Barcelona time
17:10FR 270 from Milan at the gate
11:25FR 8215 to London Stansted leaves the gate
18 h 15 apart on the timetable, overnight
FR 8215 leaves 18 h 15 after FR 270 arrives on the timetable: more than half a day, so not a connection we count.