BA 873 then BA 1336 at Heathrow
Krakow → London → Newcastle
Timetable, London time
18:05BA 873 from Krakow at the gate
17:30BA 1336 to Newcastle leaves the gate
23 h 25 apart on the timetable, overnight
BA 1336 leaves 23 h 25 after BA 873 arrives on the timetable: more than half a day, so not a connection we count.