SQ 312 then U2 8471 at Gatwick
Singapore → London → Zurich
Timetable, London time
06:25SQ 312 from Singapore at the gate
06:00U2 8471 to Zurich leaves the gate
23 h 35 apart on the timetable, overnight
U2 8471 leaves 23 h 35 after SQ 312 arrives on the timetable: more than half a day, so not a connection we count.