"Demons" was released on CD, cassette and 7" on 17 November 1997 and reached number 27 on the UK Singles Chart. The cover art is the last in a series of five Pete Fowler paintings commissioned by the band for Radiator and its singles. Fowler's art was inspired by "Demons" and depicts "the unholy tribes of the undead" according to Record Collector. The packaging of the single features the Welsh language quote "Esmwyth! Esmwyth! Dim blewyn o'i le!", which roughly translates into English as "Smooth! Smooth! Not a hair out of place!". It is the last single by the group to contain such a quote, bringing to an end a practise that started with their debut single "Hometown Unicorn". The track was included on the band's 'greatest hits' compilation album Songbook: The Singles, Vol. 1, issued in 2004.