The common law recognises two defences to a criminal charge that an accused can plead, based upon a belief that the law permitted him to act as he did. First there is the well-known substantive defence of bona fide claim of right, which operates to negative mens rea, and thus absolves from criminal liability, and secondly the procedural defence, open to an accused summarily charged, that adjudication involves a decision as to his property or title and therefore the jurisdiction of the justices to determine in a summary manner is ousted. For the latter defence, the helpful phrase “dispute of title” has recently been coined. The basic problem is to distinguish this from the deceptively similar defence of claim of right. Writers are prone to dismiss the defence of dispute of title in rather cursory fashion before concentrating on claim of right, and to utter solemn warnings against confusing the two, but it is not unknown for a writer to disregard his own admonitions, and fall into the very pit he has observed yawning before his eyes. Judges, with one notable exception, have surmounted this original crevasse, but in matters of detail have shown that misunderstanding of the law is not confined to the accused. The object of this article is to reverse the usual practice, to dismiss the substantive defence of claim of right in a few lines, and thereafter to refer to it only so far as this is necessary to implement a detailed discussion of the procedural defence of dispute of title, either by way of comparison or as a means of showing the details of the procedural defence in sharper relief.