The Passing Bells the conclusion of the war. The series was announced by the BBC in October 2013, along with other programmes that played a part in the BBC World War I centenary season. It was a Red Planet Production with BBC Worldwide as the distributor. Filming took place in Poland. Telewizja Polska and Apple Film Production were co-producers. The series aired in the pre-watershed time-slot of 7pm, and the script was written for a younger audience and family viewing. The title was taken from the first line of Wilfred Owen's 1917 poem, "Anthem for Doomed Youth": "What passing-bells for these who die
The Bells Line leads from Richmond in Sydney's west through the Blue Mountains, the route Nash would take going home. The album's opening song, "Sleepless Nights", begins with the line, "Up on the Bells Line, we disappear ..." "That came to me as I was driving with my wife just on twilight on a cold winter's night," Nash told the "Herald Sun". "A lot of ideas come to me when I'm driving, and I like the way subconscious thoughts materialise that way." The band rehearsed for the album in an old church hall near the Nash family property before joining producer Wayne Connolly