BA 725 then BA 546 at Heathrow
Zurich → London → Bologna
Timetable, London time
07:45BA 725 from Zurich at the gate
20:25BA 546 to Bologna leaves the gate
12 h 40 apart on the timetable
BA 546 leaves 12 h 40 after BA 725 arrives on the timetable: more than half a day, so not a connection we count.