He is known for his lead role in the films Kidulthood, sequel Adulthood, and for his directorial debut, Anuvahood.

He then worked with the film's writer and director Noel Clarke on a number of other projects until 2011, including the sequel Adulthood, 4.3.2.1. and the one-off television pilot West 10 LDN.

Deacon has since appeared in many lead and supporting roles in feature films, including Bonded by Blood, Jack Falls, Shank, Everywhere and Nowhere and Payback Season.

[10] He was unable to attend a hearing in March due to being "in hospital for treatment for underlying mental health issues".

On 7 April, a jury delivered two not-guilty verdicts for affray and possessing an offensive weapon accepting Deacon was mentally ill and not criminally responsible for his actions.