BA 1357 then BA 490 at Heathrow
Saint Helier → London → Gibraltar
Timetable, London time
08:30BA 1357 from Saint Helier at the gate
06:45BA 490 to Gibraltar leaves the gate
22 h 15 apart on the timetable, overnight
BA 490 leaves 22 h 15 after BA 1357 arrives on the timetable: more than half a day, so not a connection we count.