FR 5204 then FR 126 at Dublin
Sofia → Dublin → London Gatwick
Timetable, Dublin time
00:55FR 5204 from Sofia at the gate
13:05FR 126 to London Gatwick leaves the gate
12 h 10 apart on the timetable
FR 126 leaves 12 h 10 after FR 5204 arrives on the timetable: more than half a day, so not a connection we count.