EC 8062 then U2 8315 at Gatwick
Barcelona → London → Pisa
Timetable, London time
08:55EC 8062 from Barcelona at the gate
06:25U2 8315 to Pisa leaves the gate
21 h 30 apart on the timetable, overnight
U2 8315 leaves 21 h 30 after EC 8062 arrives on the timetable: more than half a day, so not a connection we count.