U2 2531 then TP 931 at Zurich
London Luton → Zurich → Lisbon
Timetable, Zurich time
15:45U2 2531 from London Luton at the gate
13:30TP 931 to Lisbon leaves the gate
21 h 45 apart on the timetable, overnight
TP 931 leaves 21 h 45 after U2 2531 arrives on the timetable: more than half a day, so not a connection we count.