BA 1349 then BA 1402 at Heathrow
Saint Helier → London → Belfast City
Timetable, London time
16:20BA 1349 from Saint Helier at the gate
15:15BA 1402 to Belfast City leaves the gate
22 h 55 apart on the timetable, overnight
BA 1402 leaves 22 h 55 after BA 1349 arrives on the timetable: more than half a day, so not a connection we count.