[2] First commissioned by S4C's drama editor Angharad Jones in 2005,[3] as part of a drive by S4C to reach a younger audience,[4][5] the third series of Caerdydd started its run on S4C on 30 March 2008.

[8] Caerdydd (2nd series) has received three nominations for the 2008 Bafta Cymru awards: Best Screenwriter for Ed Talfan, Best Design for Hayden Pearce and Best Director of Photography (Drama) for Richard Wyn.

[13][16] The scene itself, filmed on 14 March 2008,[13] involves Lea Kennedy (played by Alys Thomas) who is working for an unnamed party group and her much older boyfriend Stephen James (Dewi Rhys Williams) having sexual intercourse.

[13][19] S4C's investigation came to this conclusion: S4C has looked into the circumstances surrounding the filming of drama series Caerdydd at the Senedd and is satisfied that the production company followed the correct procedures.

[19] Further cast: Catherine Ayers (Nia, I), Nathan Sussex, Sousila Pilay (II), Lillie Downie (Baby Ela Ford, III/4,6-10), Amelia Wyatt (Baby Ela Ford, III/3,4), Nick Ross (Gwilym, III/3), Lisa Zamira (III/3), Lee Bane (III/3), John Schumacher (III/3), Tomos James (III/3), Tyron Lopez (III/4), Gemma Prosser (III/4), Hazel Condon (III/4), Bethan Cecil (III/7), Charlote Grey (III/8), Poonah Najimohammadi (III/9), Rob Kendrick (actor) (III/9), Martin Glyn Murray (III/9), Elen Florence (I), Charmaine Hibberd (III/10), Kathryn Dimery (III/10), Megan Browne (Ela Ford), Ross O'Hennessy John Davies The Immigration Officer The second series was repeated in February and March 2008.