This paper describes a study of children's legal vocabulary and their knowledge of criminal court procedures. Subjects (aged six, eight, 10 years and adults) were also asked about their feelings regarding a hypothetical court appearance as a witness. All subjects, children and adults, performed best on a vocabulary recognition section, with descriptions and concepts proving more difficult. Observed developmental trends in both legal vocabulary and conceptual appreciation of criminal law replicates previous work from Australia and America and supports the contention that children younger than 10 years are not well informed about the legal system. Results indicated clear deficits in knowledge as well as frequent misconceptions regarding legal personnel and procedures.