EC 8064 then U2 8285 at Gatwick
Barcelona → London → Catania
Timetable, London time
14:15EC 8064 from Barcelona at the gate
07:25U2 8285 to Catania leaves the gate
17 h 10 apart on the timetable, overnight
U2 8285 leaves 17 h 10 after EC 8064 arrives on the timetable: more than half a day, so not a connection we count.