BA 238 then EI 723 at Heathrow
Boston → London → Cork
Timetable, London time
19:00BA 238 from Boston at the gate
18:05EI 723 to Cork leaves the gate
23 h 05 apart on the timetable, overnight
EI 723 leaves 23 h 05 after BA 238 arrives on the timetable: more than half a day, so not a connection we count.