This Practice Note provides practical guidance on the proper execution of documents by non-Companies Act corporations. Non-Companies Act corporations are those created by statute such as local authorities and building societies. A corporation is a body that has a legal personality separate from those of its members, meaning it can contract, generally hold property, and sue and be sued, in its own name. In this Practice Note, we are concerned with ‘corporations aggregate’, meaning corporations consisting of a body of persons, rather than ‘corporations sole’ (consisting of one person in a particular office). The term ‘body corporate’ or ‘corporation’ is broad and encompasses a variety of bodies including, for example, corporate bodies created by: • statute, such as building societies, co-operative or community benefit societies (previously known as industrial and provident societies), and friendly societies • a general Act of Parliament, such as local government authorities, corporations which control the public services and industries, bodies performing various general administrative and advisory functions, and certain bodies performing special functions of a public nature • a Royal Charter, such as