BA 126 then BA 1326 at Heathrow
Doha → London → Newcastle
Timetable, London time
07:25BA 126 from Doha at the gate
06:35BA 1326 to Newcastle leaves the gate
23 h 10 apart on the timetable, overnight
BA 1326 leaves 23 h 10 after BA 126 arrives on the timetable: more than half a day, so not a connection we count.