BA 873 then BA 318 at Heathrow
Krakow → London → Paris Charles de Gaulle
Timetable, London time
18:05BA 873 from Krakow at the gate
17:15BA 318 to Paris Charles de Gaulle leaves the gate
23 h 10 apart on the timetable, overnight
BA 318 leaves 23 h 10 after BA 873 arrives on the timetable: more than half a day, so not a connection we count.