EC 8064 then U2 819 at Gatwick
Barcelona → London → Belfast International
Timetable, London time
14:15EC 8064 from Barcelona at the gate
08:35U2 819 to Belfast International leaves the gate
18 h 20 apart on the timetable, overnight
U2 819 leaves 18 h 20 after EC 8064 arrives on the timetable: more than half a day, so not a connection we count.