In this paper we outline and critique legal approaches to poor mental health at work in the UK. We argue that the current legal framework is not ‘fit for purpose’. Overall, the existing framework promotes a problematic model that is ineffective because each element, individually and as part of the whole, fails to adequately engage with the nuanced realities of the relationship between undertaking paid work and suffering poor mental health. It is, we suggest, disjointed because it has evolved from a patchwork of provisions, each with different foundations, motivations, ambitions and flaws. The need for a re-focus, and what this might entail, is considered, and the capacity of a model centred on addressing workplace mental health as a manifestation of broader notions of vulnerability is explored.