SQ 306 then BA 784 at Heathrow
Singapore → London → Stockholm
Timetable, London time
07:40SQ 306 from Singapore at the gate
19:55BA 784 to Stockholm leaves the gate
12 h 15 apart on the timetable
BA 784 leaves 12 h 15 after SQ 306 arrives on the timetable: more than half a day, so not a connection we count.