FR 7798 then BA 837 at Dublin
Lanzarote → Dublin → London Heathrow
Timetable, Dublin time
00:45FR 7798 from Lanzarote at the gate
19:25BA 837 to London Heathrow leaves the gate
18 h 40 apart on the timetable
BA 837 leaves 18 h 40 after FR 7798 arrives on the timetable: more than half a day, so not a connection we count.