Y Dydd Olaf was initially released by Peski Records in October 2014 before being re-released worldwide in 2015 by Heavenly Recordings. The album was an attempt by Gwenno to combine her political views with sounds she loves and was inspired in part by a dystopian science fiction book of the same name by Owain Owain which was released in 1976.

In a period of governmental and cultural revolution, former Pipettes front-woman, Gwenno, releases a political concept album inspired by an obscure 1970s Welsh language sci-fi novel, subtly disguised as a blissful kraut-pop record. Taking its cue, and title, from Owain Owain's 1976 novel about a dystopian future where the robots have taken over and are busily turning the human race into clones through the use of medication, Y Dydd Olaf blends big themes (including patriarchal society, government-funded media propaganda, cultural control, technology, isolation and the importance of, and threat to minority languages), great tunes, and a real sense of revolution to produce a powerful, politically-charged concept album. Y Dydd Olaf is a political, feminist, brilliantly executed record; and although this particular revolution might not be televised, it certainly will have a great soundtrack.