R_v_Morris;_Anderton_v_Burnside
R v Morris; Anderton v Burnside [1984] are English highest court conjoined appeal decisions as to the extent of appropriation that can be considered criminal (as the law of theft is codified in the Theft Act 1968).
R v Morris was a final appeal from the Court of Appeal; Anderton v Burnside a leapfrog final appeal from the Divisional Court (the usual first appellate court from the Magistrates if a point of law is in question).
Agreeing with Lord Roskill, per curiam (formulating the decision of the whole court), the Law Lords established that in the English law of theft, an appropriation is established if the defendant clearly assumes a right of the owner, that is the prosecution proves such assumption beyond a reasonable doubt.