In this article, Andrew Bowen looks at the case of 'Axa Sun Life Services v Campbell Martin Ltd [2011] EWCA Civ 133'. The decision by The Court of Appeal provides a masterclass on the drafting of an entire agreement clause and emphasises the need to be clear about what parties to a commercial contract intend to include or exclude from their agreement if these clauses are to be given effect to by the courts. This article originally appeared in issue 113 of W. Greens Business Law Bulletin and is reproduced here with their kind permission.