This essay discusses the significance of written constitution in United Kingdom and critically examines it with the help of cases and examples. It explores the arguments for and against adopting a written constitution in UK. The lack of written constitution in UK has significant attention over the past times in respect of meeting the expectations of the British citizens by current constitutional arrangements. The essay also discusses the codified and uncodified constitution, reasons for not having a written constitution in UK, and the benefits of adopting a written constitution.