Commercial analysis: The Court of Appeal has confirmed in the case of King Crude Carriers SA v Ridgebury November LLC that the ‘Mackay v Dick Principle’, a principle that originates from the speech of Lord Watson in the Scottish case of Mackay v Dick & Stevenson, forms part of English law. In accordance with this principle, if a party’s obligation to pay a debt is subject to a condition and the debtor wrongfully prevents that condition from being fulfilled, the condition is treated as either dispensed with or fulfilled, with the result that the debt accrues. Written by Pippa Borton, associate, and David Bridge, solicitor advocate, both at CMS.