LA 5798 then BA 8072 at Barcelona
Lisbon → Barcelona → London Gatwick
Timetable, Barcelona time
23:55LA 5798 from Lisbon at the gate
14:55BA 8072 to London Gatwick leaves the gate
15 h apart on the timetable, overnight
BA 8072 leaves 15 h after LA 5798 arrives on the timetable: more than half a day, so not a connection we count.