BA 985 then BA 864 at Heathrow
Berlin → London → Prague
Timetable, London time
19:30BA 985 from Berlin at the gate
18:05BA 864 to Prague leaves the gate
22 h 35 apart on the timetable, overnight
BA 864 leaves 22 h 35 after BA 985 arrives on the timetable: more than half a day, so not a connection we count.