BA 242 then BA 1332 at Heathrow
Mexico City → London → Newcastle
Timetable, London time
13:10BA 242 from Mexico City at the gate
11:45BA 1332 to Newcastle leaves the gate
22 h 35 apart on the timetable, overnight
BA 1332 leaves 22 h 35 after BA 242 arrives on the timetable: more than half a day, so not a connection we count.