[2] Coming from an Irish-Catholic background, Deery believed that enforced celibacy was a 'time bomb waiting to go off' in the Catholic Church and began researching his first feature film, Conspiracy of Silence, which he wrote and directed.

[5][6] The film was also screened in September 2010, two days before Pope Benedict XVI's visit to the UK, at the Odeon West End in London's Leicester Square, where it formed the backdrop to a public debate about priestly celibacy in the Roman Catholic Church.

[8][9] It was digitally remastered in 2023 and re-released on VOD and streaming services, including Amazon Prime and Apple TV worldwide by Bohemia Media.

[10] Since Conspiracy of Silence, Deery has also directed several big dramas for television including If I Had You, a 2-hour single film for ITV1, starring Sarah Parish and Paul McGann which was screened in 2006.

He also directed two 90-minute specials of the hit UK comedy/drama series, Fat Friends starring James Corden, Ruth Jones and Alison Steadman.