It is generally accepted that adherence to the Rule of Law is fundamental to and is one of the defining features of a civilised society. The “Rule of Law” is an ancient principle and has been subject to many interpretations over the centuries. It is a concept found in many countries and is not unique to the United Kingdom. However, although it is a phrase universally used, it is not comprehensively defined in any jurisdiction, although it is commonly understood to mean that every member of a society is bound by and entitled to the benefit of laws which are publicly made and publicly administered and which do not have retrospective effect.
So, all are subject to and equal under the law, even rulers and governments. In essence it can be said that the rationale of the Rule of Law is to provide a safeguard against arbitrary governance whether by totalitarian leaders, elected governments or mob rule.