LA 5798 then IB 5406 at Barcelona
Lisbon → Barcelona → London Gatwick
Timetable, Barcelona time
23:55LA 5798 from Lisbon at the gate
12:30IB 5406 to London Gatwick leaves the gatealso LL 5406, VY 7610
12 h 35 apart on the timetable, overnight
IB 5406 leaves 12 h 35 after LA 5798 arrives on the timetable: more than half a day, so not a connection we count.