BA 713 then BA 544 at Heathrow
Zurich → London → Bologna
Timetable, London time
14:30BA 713 from Zurich at the gate
14:25BA 544 to Bologna leaves the gate
23 h 55 apart on the timetable, overnight
BA 544 leaves 23 h 55 after BA 713 arrives on the timetable: more than half a day, so not a connection we count.