“In the well-known case of Armory v Delamirie (1722) 1 Stra 505… the Chief Justice directed the jury that unless the defendant produce the jewel and show it not to be of the finest water, they should presume the strongest against him, and make the value of the best jewels the measure of their damages: which they accordingly did. It has been recognised in subsequent authorities that in so directing the jury the Chief Justice was applying a general principle to the effect that, in a case where the defendant has wrongfully deprived the claimant of property of value (be it an item of physical property or a chose in action), the court will, save to the extent that it is persuaded otherwise by the defendant, assess the value of the missing property on a basis which is generous to the claimant. I respectfully agree that the principle in Armory v Delamirie is not directed at the legal burden of proof, rather it raises an evidential (i.e. rebuttable) presumption in favour of the claimant which gives him the benefit of any relevant doubt. The practical effect of that is to give the claimant a fair wind in establishing the value of what he had lost.”