FR 4586 then IB 5412 at Barcelona
Porto → Barcelona → London Gatwick
Timetable, Barcelona time
21:10FR 4586 from Porto at the gate
14:30IB 5412 to London Gatwick leaves the gatealso LL 5412, VY 7616, BA 8070
17 h 20 apart on the timetable, overnight
IB 5412 leaves 17 h 20 after FR 4586 arrives on the timetable: more than half a day, so not a connection we count.