EC 7681 then BA 477 at Barcelona
Lisbon → Barcelona → London Heathrow
Timetable, Barcelona time
21:20EC 7681 from Lisbon at the gate
12:40BA 477 to London Heathrow leaves the gate
15 h 20 apart on the timetable, overnight
BA 477 leaves 15 h 20 after EC 7681 arrives on the timetable: more than half a day, so not a connection we count.