SK 1768 then BA 781 at Arlanda
Prague → Stockholm → London Heathrow
Timetable, Stockholm time
21:15SK 1768 from Prague at the gate
17:40BA 781 to London Heathrow leaves the gate
20 h 25 apart on the timetable, overnight
BA 781 leaves 20 h 25 after SK 1768 arrives on the timetable: more than half a day, so not a connection we count.