BA 553 then BA 1334 at Heathrow
Rome → London → Newcastle
Timetable, London time
15:20BA 553 from Rome at the gate
14:25BA 1334 to Newcastle leaves the gate
23 h 05 apart on the timetable, overnight
BA 1334 leaves 23 h 05 after BA 553 arrives on the timetable: more than half a day, so not a connection we count.