U2 868 then U2 8421 at Gatwick
Glasgow → London → Nice
Timetable, London time
17:40U2 868 from Glasgow at the gate
17:25U2 8421 to Nice leaves the gate
23 h 45 apart on the timetable, overnight
U2 8421 leaves 23 h 45 after U2 868 arrives on the timetable: more than half a day, so not a connection we count.