BA 751 then BA 784 at Heathrow
Geneva → London → Stockholm
Timetable, London time
07:35BA 751 from Geneva at the gate
19:55BA 784 to Stockholm leaves the gate
12 h 20 apart on the timetable
BA 784 leaves 12 h 20 after BA 751 arrives on the timetable: more than half a day, so not a connection we count.