FR 1977 then FR 255 at Dublin
Riga → Dublin → London Stansted
Timetable, Dublin time
20:35FR 1977 from Riga at the gate
15:55FR 255 to London Stansted leaves the gate
19 h 20 apart on the timetable, overnight
FR 255 leaves 19 h 20 after FR 1977 arrives on the timetable: more than half a day, so not a connection we count.