BA 391 then BA 782 at Heathrow
Brussels → London → Stockholm
Timetable, London time
16:15BA 391 from Brussels at the gate
16:00BA 782 to Stockholm leaves the gate
23 h 45 apart on the timetable, overnight
BA 782 leaves 23 h 45 after BA 391 arrives on the timetable: more than half a day, so not a connection we count.