BA 853 then EI 159 at Heathrow
Prague → London → Dublin
Timetable, London time
12:20BA 853 from Prague at the gate
12:10EI 159 to Dublin leaves the gate
23 h 50 apart on the timetable, overnight
EI 159 leaves 23 h 50 after BA 853 arrives on the timetable: more than half a day, so not a connection we count.