EC 8064 then U2 8843 at Gatwick
Barcelona → London → Reykjavík
Timetable, London time
14:15EC 8064 from Barcelona at the gate
08:00U2 8843 to Reykjavík leaves the gate
17 h 45 apart on the timetable, overnight
U2 8843 leaves 17 h 45 after EC 8064 arrives on the timetable: more than half a day, so not a connection we count.