The ANGELIC methodology was developed to encapsulate knowledge of particular legal domains. In this paper we describe its use to build a full scale practical application intended to be used internally by Weightmans, a large firm of legal practitioners with branches throughout the UK. We describe the domain, Noise Induced Hearing Loss (NIHL), the intended task, the sources used, the stages in development and the resulting application. An assessment of the project and its potential for further development is discussed. The project shows that current academic research using computational models of argument can prove useful to legal practitioners confronted by real legal tasks.