When people are busy slip ups sometimes occur. However, the recent case of Rayford Homes Ltd v Bank of Scotland plc  EWHC 1948 (Ch) reminds us that slip ups can be costly. In Rayford the parties referred to a defined term, although it was not used in the agreement. A slip up. So what? To one party's surprise the court decided that the unused definition must have meant something and it interpreted the agreement in accordance with the unused term. Therefore, even if you are busy it pays to double check your contracts before they are signed to make sure that there are no slip ups.