The UK Supreme Court has recently overturned a much-criticised and controversial ruling of the Court of Appeal by finding an ambiguously worded advance payment bond effective in the case of insolvency. In doing so, it clarified the proper role and application of considerations of business common sense when interpreting commercial contracts. Where a clause is capable of two or more possible interpretations, Rainy Sky SA v Kookmin Bank held that the court should prefer the one which is most consistent with common business sense.