BA 1333 then OU 491 at Heathrow
Newcastle → London → Zagreb
Timetable, London time
17:10BA 1333 from Newcastle at the gate
16:50OU 491 to Zagreb leaves the gate
23 h 40 apart on the timetable, overnight
OU 491 leaves 23 h 40 after BA 1333 arrives on the timetable: more than half a day, so not a connection we count.