BA 8 then BA 834 at Heathrow
Tokyo → London → Dublin
Timetable, London time
15:35BA 8 from Tokyo at the gate
15:25BA 834 to Dublin leaves the gate
23 h 50 apart on the timetable, overnight
BA 834 leaves 23 h 50 after BA 8 arrives on the timetable: more than half a day, so not a connection we count.