> The United Kingdom constitution is composed of the laws and rules that create the institutions of the state, regulate the relationships between those institutions, or regulate the relationship between the state and the individual. These laws and rules are not codified in a single, written document.
Source for that quote is parliamentary: https://www.parliament.uk/globalassets/documents/commons-com... - a publication from 2015 which considered and proposed a written constitution. But other definitions include unwritten things like customs and conventions. For example:
> It is often noted that the UK does not have a ‘written’ or ‘codified’ constitution. It is true that most countries have a document with special legal status that contains some of the key features of their constitution. This text is usually upheld by the courts and cannot be changed except through an especially demanding process. The UK, however, does not possess a single constitutional document of this nature. Nevertheless, it does have a constitution. The UK’s constitution is spread across a number of places. This dispersal can make it more difficult to identify and understand. It is found in places including some specific Acts of Parliament; particular understandings of how the system should operate (known as constitutional conventions); and various decisions made by judges that help determine how the system works.
https://consoc.org.uk/the-constitution-explained/the-uk-cons...
