W6 2375 then FR 9811 at Barcelona
Budapest → Barcelona → London Stansted
Timetable, Barcelona time
08:40W6 2375 from Budapest at the gate
07:55FR 9811 to London Stansted leaves the gate
23 h 15 apart on the timetable, overnight
FR 9811 leaves 23 h 15 after W6 2375 arrives on the timetable: more than half a day, so not a connection we count.