BA 349 then EI 723 at Heathrow
Nice → London → Cork
Timetable, London time
21:05BA 349 from Nice at the gate
18:05EI 723 to Cork leaves the gate
21 h apart on the timetable, overnight
EI 723 leaves 21 h after BA 349 arrives on the timetable: more than half a day, so not a connection we count.