OS 335 then AY 1334 at Heathrow
Vienna → London → Helsinki
Timetable, London time
14:05OS 335 from Vienna at the gate
13:35AY 1334 to Helsinki leaves the gate
23 h 30 apart on the timetable, overnight
AY 1334 leaves 23 h 30 after OS 335 arrives on the timetable: more than half a day, so not a connection we count.