U2 874 then U2 8243 at Gatwick
Saint Helier → London → Thessaloniki
Timetable, London time
10:40U2 874 from Saint Helier at the gate
09:00U2 8243 to Thessaloniki leaves the gate
22 h 20 apart on the timetable, overnight
U2 8243 leaves 22 h 20 after U2 874 arrives on the timetable: more than half a day, so not a connection we count.