EC 8424 then U2 8315 at Gatwick
Nice → London → Pisa
Timetable, London time
08:05EC 8424 from Nice at the gate
06:25U2 8315 to Pisa leaves the gate
22 h 20 apart on the timetable, overnight
U2 8315 leaves 22 h 20 after EC 8424 arrives on the timetable: more than half a day, so not a connection we count.