EI 156 then BA 872 at Heathrow
Dublin → London → Krakow
Timetable, London time
10:10EI 156 from Dublin at the gate
06:05BA 872 to Krakow leaves the gate
19 h 55 apart on the timetable, overnight
BA 872 leaves 19 h 55 after EI 156 arrives on the timetable: more than half a day, so not a connection we count.