BA 801 then BA 360 at Heathrow
Reykjavík → London → Lyon
Timetable, London time
15:05BA 801 from Reykjavík at the gate
14:45BA 360 to Lyon leaves the gate
23 h 40 apart on the timetable, overnight
BA 360 leaves 23 h 40 after BA 801 arrives on the timetable: more than half a day, so not a connection we count.