SK 1 then SK 1527 at Arlanda
Lulea → Stockholm → London Heathrow
Timetable, Stockholm time
07:35SK 1 from Lulea at the gate
19:45SK 1527 to London Heathrow leaves the gate
12 h 10 apart on the timetable
SK 1527 leaves 12 h 10 after SK 1 arrives on the timetable: more than half a day, so not a connection we count.