BA 483 then BA 546 at Heathrow
Barcelona → London → Bologna
Timetable, London time
19:25BA 483 from Barcelona at the gate
18:10BA 546 to Bologna leaves the gate
22 h 45 apart on the timetable, overnight
BA 546 leaves 22 h 45 after BA 483 arrives on the timetable: more than half a day, so not a connection we count.