SK 1854 then BA 781 at Arlanda
Alicante → Stockholm → London Heathrow
Timetable, Stockholm time
21:05SK 1854 from Alicante at the gate
18:10BA 781 to London Heathrow leaves the gate
21 h 05 apart on the timetable, overnight
BA 781 leaves 21 h 05 after SK 1854 arrives on the timetable: more than half a day, so not a connection we count.