Under the Companies Act 2006 the articles of association is document in which the constitution of a company is defined and includes fundamentals such as the name and the internal regulations and bye-laws covering procedure, shares, meetings, directors and other administrative issues.
Model articles are set out in The Companies (Model Articles) Regulations 2008 and are often used as the basis for a company's articles of association document. The model articles apply, by default, to companies who do not provide their own set of articles of association when registering the company. Changes to a company's articles may be made by special resolution.