SK 1842 then SK 533 at Arlanda
Rome → Stockholm → London Heathrow
Timetable, Stockholm time
23:55SK 1842 from Rome at the gate
18:10SK 533 to London Heathrow leaves the gate
18 h 15 apart on the timetable, overnight
SK 533 leaves 18 h 15 after SK 1842 arrives on the timetable: more than half a day, so not a connection we count.