SK 711 then BA 779 at Arlanda
Helsinki → Stockholm → London Heathrow
Timetable, Stockholm time
20:05SK 711 from Helsinki at the gate
15:25BA 779 to London Heathrow leaves the gate
19 h 20 apart on the timetable, overnight
BA 779 leaves 19 h 20 after SK 711 arrives on the timetable: more than half a day, so not a connection we count.