BA 801 then BA 1334 at Heathrow
Reykjavík → London → Newcastle
Timetable, London time
15:05BA 801 from Reykjavík at the gate
14:40BA 1334 to Newcastle leaves the gate
23 h 35 apart on the timetable, overnight
BA 1334 leaves 23 h 35 after BA 801 arrives on the timetable: more than half a day, so not a connection we count.