BA 359 then BA 858 at Heathrow
Lyon → London → Prague
Timetable, London time
15:05BA 359 from Lyon at the gate
14:25BA 858 to Prague leaves the gate
23 h 20 apart on the timetable, overnight
BA 858 leaves 23 h 20 after BA 359 arrives on the timetable: more than half a day, so not a connection we count.