EC 7638 then U2 8512 at Lisbon
Nantes → Lisbon → London Gatwick
Timetable, Lisbon time
17:05EC 7638 from Nantes at the gate
16:20U2 8512 to London Gatwick leaves the gate
23 h 15 apart on the timetable, overnight
U2 8512 leaves 23 h 15 after EC 7638 arrives on the timetable: more than half a day, so not a connection we count.