BA 1347 then IB 716 at Heathrow
Saint Helier → London → Madrid
Timetable, London time
11:45BA 1347 from Saint Helier at the gate
11:25IB 716 to Madrid leaves the gate
23 h 40 apart on the timetable, overnight
IB 716 leaves 23 h 40 after BA 1347 arrives on the timetable: more than half a day, so not a connection we count.