VY 7606 then U2 821 at Gatwick
Barcelona → London → Belfast International
Timetable, London time
12:20VY 7606 from Barcelona at the gate
12:15U2 821 to Belfast International leaves the gate
23 h 55 apart on the timetable, overnight
U2 821 leaves 23 h 55 after VY 7606 arrives on the timetable: more than half a day, so not a connection we count.