FI 454 then BA 752 at Heathrow
Reykjavík → London → Geneva
Timetable, London time
19:30FI 454 from Reykjavík at the gate
19:25BA 752 to Geneva leaves the gate
23 h 55 apart on the timetable, overnight
BA 752 leaves 23 h 55 after FI 454 arrives on the timetable: more than half a day, so not a connection we count.