This dissertation aims to analyse whether the Corporate Manslaughter and Corporate Homicide Act (CMCHA) 2007 is a suitable legal vehicle for convicting companies of manslaughter across the United Kingdom. The dissertation will demonstrate through the theoretical, socio-legal and doctrinal approach that the CMCHA 2007 is not a suitable vehicle for prosecuting companies. It achieves this by examining Ashworth’s principles of criminal law including retroactivity, strict construction, liability and proportionality. Furthermore, case studies are considered to demonstrate the CMCHA 2007 is not suitable including; R v P&O European Ferries (Dover)1 and R v Kite (Peter Bayliss).2 The importance of this dissertation is to highlight to the government that the CMCHA 2007 needs amendments including conferring prosecuting powers to the Health and Safety Executive.